《测试技术基础》东大19秋在线平时作业123-东北大学-无忧答案网

端木老师 发表于 2019-11-6 10:31:22

《测试技术基础》东大19秋在线平时作业123

19秋学期《测试技术基础》在线平时作业1
奥鹏作业答案可以联系q 761296021
1.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">有一测力电桥
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="523" height="181" alt="" src="http://file.open.com.cn/ItemDB/65628/4c9e5dda-5a0f-4750-9c58-28dbdc939929/201461516177117.jpg" />

A.A
B.B
C.C
D.D
正确答案:——A——
2.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-weight: bold">满足不真测试条件的测试系统，其幅频特性和相频特性为（<span style="FONT-FAMILY: "Times New Roman"; COLOR: red; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US"> <span style="FONT-FAMILY: 宋体; COLOR: red; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">）
<span style="FONT-FAMILY: 宋体; COLOR: red; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="487" height="107" alt="" src="http://file.open.com.cn/ItemDB/65628/422c8181-1a45-4e0b-83ff-5592598355f1/2014614123831243.jpg" />

A.A
B.B
C.C
D.D
正确答案:——C——
3.[单选题] <img height="117" alt="" width="392" src="http://file.open.com.cn/ItemDB/65628/dd183efd-32af-4888-ae49-9a0f4d784732/20102114641404.jpg" />

xua选择题

A.A
B.B
C.C
D.D
正确答案:——C——
4.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">将若矩形窗函数
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="499" height="99" alt="" src="http://file.open.com.cn/ItemDB/65628/0556414e-8047-486b-a9ff-d6e0c7a6fcb1/2014615133113244.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
5.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">设一带通滤波器的下截止频率为
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img alt="" width="546" height="231" src="http://file.open.com.cn/ItemDB/65628/152ec265-80be-499a-9115-669b5ac201de/2014615102345738.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
6.[单选题] 传感器的动态特性越好，说明传感器的响应在被测频率范围内（ ）。
A.精度越高
B.精度越差
C.对被测信号的反应能力越快
D.对被测信号的反应能力越慢
正确答案:————
7.[单选题] <img height="165" alt="" width="518" src="http://file.open.com.cn/ItemDB/65628/64de9c6d-05c1-4379-8ff0-88e82c9d4990/20102122813534.jpg" />end
A.A
B.B
C.C
D.D
正确答案:————
8.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">两个信号叠加:
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="597" height="143" alt="" src="http://file.open.com.cn/ItemDB/65628/890c97bd-5f0a-4320-809c-f8ca9e0bde7d/2014610214012968.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
9.[单选题] 按照奈奎斯特采样定理，采样频率至少为（）（A）有用的最高频率的一半(B)有用的最高频率的两倍(C)与有用的最高频率相同(D)有用的最高频率的3倍
A.A
B.B
C.C
D.D
正确答案:————
10.[单选题] <span style="FONT-SIZE: 14pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">选择题
<span style="FONT-SIZE: 14pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img height="136" alt="" width="415" src="http://file.open.com.cn/ItemDB/65628/92ce29c2-5b00-4cf5-8ddf-e9f6640c65cd/201013121193322.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
11.[判断题] 在计算机测试系统的基本组成中，采用多路模拟开关来实现信号测量通道的切换，将多路输入信号同时输入公用的输入回路进行测量。
A.错误
B.正确
正确答案:————
12.[判断题] 热力学温度与摄氏温度之间的关系为：（ ）t=T+273.15
A.错误
B.正确
正确答案:————
13.[判断题] 靶式流量计是以管内流动的流体给予插入管中的靶的推力来测量流量的一种测量装置。（ ）
A.错误
B.正确
正确答案:————
14.[判断题] 传感器的灵敏度越高，可以感知越小的变化量，即被测量稍有微小变化时，传感器即有较大的输出。（）
A.错误
B.正确
正确答案:————
15.[判断题] 判断题在压磁式测力装置中，硅钢在受压缩时，其导磁率沿应力方向增加，而沿应力的垂向则下降。
A.错误
B.正确
正确答案:————
16.[判断题] 超声波在静止流体中传播速度为C，流体速度为V，顺流时，传播速度为C+V，逆流时，传播速度为C-V。测出两者差 2V，就可求得流体速度V.。（ ）
A.错误
B.正确
正确答案:————
17.[判断题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-weight: bold">直流电桥的平衡条件为 <img width="169" height="58" alt="" src="http://file.open.com.cn/ItemDB/65628/f5ca4835-6457-4e96-9df0-9e7e03cb6cd2/2014615101429833.jpg" /> 
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-weight: bold"> <span style="FONT-FAMILY: 宋体; COLOR: red; FONT-SIZE: 14pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">（ ）

A.错误
B.正确
正确答案:————
18.[判断题] 周期信号的三角函数展开形式的频谱是双边谱；复指数展开形式的频谱是单边谱。
A.错误
B.正确
正确答案:————
19.[判断题]功率谱是在时域描述两个信号之间相关程度的无量纲的函数。（）
A.错误
B.正确
正确答案:————
20.[判断题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">由两个传递函数<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">经并联后组成的测试系统<span style="FONT-FAMILY: "Times New Roman"; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，其传递函数为<span style="FONT-FAMILY: "Times New Roman"; FONT-SIZE: 12pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang="EN-US"><span style="FONT-FAMILY: 宋体; COLOR: red; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-size: 14.0pt"> （）
<span style="FONT-FAMILY: 宋体; COLOR: red; FONT-SIZE: 10.5pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-size: 14.0pt"><img alt="" src="http://file.open.com.cn/ItemDB/65628/53e570e2-5e46-4a2d-8da4-fbea088b0031/2014614112546275.jpg" />

A.错误
B.正确
正确答案:————

19秋学期《测试技术基础》在线平时作业2
1.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">矩形窗函数<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">傅里叶变换:
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="614" height="136" alt="" src="http://file.open.com.cn/ItemDB/65628/49fc85b3-c5cc-4100-91d8-81ff09320944/2014610213636617.jpg" />

A.A
B.B
C.C
D.D
正确答案:——A——
2.[单选题] end
<img height="280" alt="" width="508" src="http://file.open.com.cn/ItemDB/65628/8e5c0a21-be63-4dd6-8156-69031564e0be/201021112127372.jpg" />

A.A
B.B
C.C
D.D
正确答案:——A——
3.[单选题] <span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-weight: bold">时域信号与<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">频域信号
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="473" height="144" alt="" src="http://file.open.com.cn/ItemDB/65628/0db343e4-0bbe-4b60-bbe5-eb9fe9e14afc/201461021482393.jpg" />

A.A
B.B
C.C
D.D
正确答案:——C——
4.[单选题] 选择题1. 概率密度函数曲线下的面积等于（）A. 0.1B. 0.7C. 1.0D. 2.0
A.A
B.B
C.C
D.D
正确答案:————
5.[单选题] <span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">带通滤波器<img height="243" width="534" alt="" src="http://file.open.com.cn/ItemDB/65628/e96b64ec-e42f-44aa-9f9a-66b0b4112724/201021165834271.jpg" />
A.A
B.B
C.C
D.D
正确答案:————
6.[单选题] 不失真的幅频相频特性
<img height="127" width="443" alt="" src="http://file.open.com.cn/ItemDB/65628/37d66957-5efd-4a2d-9ae3-d623287dd384/201021145346144.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
7.[单选题] 在随机误差分析中，标准差<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s决定了随机误差正态分布的形态，<o:p></o:p>
下面对<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s1、<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s2和<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s3间的关系表达正确的是（ ）<o:p></o:p>
（A）<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s1＜<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s2＜<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s3 (B) <span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s1＞<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s2＞<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s3<o:p></o:p>
（C）<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s2＞<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s1＞<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s3 (D) <span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s3＞<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s1＞<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-weight: bold; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">s2
<img alt="" width="310" height="186" src="http://file.open.com.cn/ItemDB/65628/42fad58e-4f3b-44f2-b788-8877a267fe5a/2014612174516862.jpg" /><o:p></o:p>

A.A
B.B
C.C
D.D
正确答案:————
8.[单选题] end<img alt="" src="http://file.open.com.cn/ItemDB/65628/1fdf0e8c-7c30-4656-af17-d3b730dee621/20102113423854.jpg" />
A.A
B.B
C.C
D.D
正确答案:————
9.[单选题] 选择题:由两个时间具有少量频率差的波形引起的拍频等于（）（A）两个频率的平均（B）两个频率的和（c）两个频率的差（D）两个频率之比
A.A
B.B
C.C
D.D
正确答案:————
10.[单选题]
选择题
<img alt="" src="http://file.open.com.cn/ItemDB/65628/ba0adc0f-817a-4517-8541-dfd091c915f9/20101312148920.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
11.[判断题] 金属或半导体薄片置于磁场中，当有电流流过时，在平行于电流和磁场的方向上将产生电动势，这种物理现象称为霍尔效应。（）
A.错误
B.正确
正确答案:————
12.[判断题] <span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">当<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"> <img height="26" width="56" alt="" src="http://file.open.com.cn/ItemDB/65628/4469de34-c443-43f1-8b1c-f5b43db10cbc/201021105717644.jpg" /><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"></v:path><o:lock v:ext="edit" aspectratio="t"></o:lock></v:shapetype><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">时，说明<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">x<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">y<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">两变量不是理想的线性相关；
A.错误
B.正确
正确答案:————
13.[判断题] 测试技术与计算机技术、自动控制技术、通信技术不同，不属于信息科学的范畴。
A.错误
B.正确
正确答案:————
14.[判断题] 若信号幅值离散，独立变量连续，则称为数字信号。
A.错误
B.正确
正确答案:————
15.[判断题] 计算器上的蜂鸣器是利用压电元件的_逆压电效应制成的。（ ）
A.错误
B.正确
正确答案:————
16.[判断题] 周期函数的自相关函数仍为同频率的周期函数
A.错误
B.正确
正确答案:————
17.[判断题] 判断题响度级是一个相对量，有时需要用绝对值来表示，故引出响度单位宋的概念。1宋为40方的响度级。
A.错误
B.正确
正确答案:————
18.[判断题] 若线性系统的输入为某一的简谐信号，则其稳态响应必为同频率的简谐信号。（ ）
A.错误
B.正确
正确答案:————
19.[判断题] 在压磁式测力装置中，硅钢在受压缩时，其导磁率沿应力方向增加，而沿应力的垂向则下降。（ ）
A.错误
B.正确
正确答案:————
20.[判断题] 判断题对于磁电感应式扭矩测量，当转轴受扭矩时，两线圈输出信号相位差不为零，且随两齿轮所在横截面之间相对扭转角的增加而加大，其大小与相对扭转角、扭矩成正比。
A.错误
B.正确
正确答案:————

19秋学期《测试技术基础》在线平时作业3
1.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">两个信号叠加:
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="597" height="143" alt="" src="http://file.open.com.cn/ItemDB/65628/890c97bd-5f0a-4320-809c-f8ca9e0bde7d/2014610214012968.jpg" />

A.A
B.B
C.C
D.D
正确答案:——C——
2.[单选题] <span style="FONT-SIZE: 14pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">选择题
<span style="FONT-SIZE: 14pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img height="91" alt="" width="577" src="http://file.open.com.cn/ItemDB/65628/0352e875-55ff-4399-b09b-045ba0d8ee0d/2010131211226348.jpg" />

A.A
B.B
C.C 无忧答案网 q1647861640
D.D
正确答案:——D——
3.[单选题] 傅立叶变换性质
<img width="586" height="79" alt="" src="http://file.open.com.cn/ItemDB/65628/d70ab656-5ed5-4722-b17e-877fb9826613/201461021323562.jpg" />

A.A
B.B
C.C
D.D
正确答案:——D——
4.[单选题] <span style="FONT-SIZE: 14pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">选择题<img height="143" alt="" width="577" src="http://file.open.com.cn/ItemDB/65628/015bb9f8-e351-4fdd-a9a2-7cf618341889/20101312115316.jpg" />
A.A
B.B
C.C
D.D
正确答案:————
5.[单选题] 按照奈奎斯特采样定理，采样频率至少为（）（A）有用的最高频率的一半(B)有用的最高频率的两倍(C)与有用的最高频率相同(D)有用的最高频率的3倍
A.A
B.B
C.C
D.D
正确答案:————
6.[单选题] <span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">下面对线性系统的输入、输出间关系表述正确的是
<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img width="487" height="114" alt="" src="http://file.open.com.cn/ItemDB/65628/52474db7-d4aa-4bb4-8c62-f34e981d1a50/2014614123339138.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
7.[单选题] 两个信号叠加:
<img width="595" height="159" alt="" src="http://file.open.com.cn/ItemDB/65628/6ac95ca9-0f80-46d5-8105-b2e8015e180d/2014610181138149.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
8.[单选题] <span style="FONT-SIZE: 14pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">选择题
<span style="FONT-SIZE: 14pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img height="136" alt="" width="415" src="http://file.open.com.cn/ItemDB/65628/92ce29c2-5b00-4cf5-8ddf-e9f6640c65cd/201013121193322.jpg" />

A.A
B.B
C.C
D.D
正确答案:————
9.[单选题] 当某些晶体沿一定方向受外力作用而变形时，其相应的两个相对表面产生极性相反的电荷，去掉外力时电荷消失，这种现象称为（）。
A.压阻效应
B.压敏效应
C.逆压电效应
D.正压电效应
正确答案:————
10.[单选题] <img height="105" width="440" alt="" src="http://file.open.com.cn/ItemDB/65628/aa8d0df9-d179-45ad-8f9b-81601a0974f5/201021144736248.jpg" />

线性系统输入输出

A.A
B.B
C.C
D.D
正确答案:————
11.[判断题] 判断题中间导体定律指出，在热电偶回路中，只要接入的第三导体两端温度不同，则对回路的总的热电势没有影响。
A.错误
B.正确
正确答案:————
12.[判断题] 正弦信号的自相关函数保留了信号的幅值信息和频率信息，但是失去了相位的信息。（）
A.错误
B.正确
正确答案:————
13.[判断题] 非确定性信号又称为随机信号，是有法用明确的数学关系式表达的信号。
A.错误
B.正确
正确答案:————
14.[判断题] RC低通滤波器电路的电容阻与输出并联。
A.错误
B.正确
正确答案:————
15.[判断题] 脉冲锤敲击被测对象，对被测对象施加一个力脉冲，同时测量激励和被测对象。脉冲的持续时间为τ,τ取决于锤端的材料；材料越硬，τ越小，则频率范围越小；（ ）
A.错误
B.正确
正确答案:————
16.[判断题] 传感器的功能是将被测信息转换成某种电信号的器件。它包括敏感器和转换器两部分。
A.错误
B.正确
正确答案:————
17.[判断题] 各类瞬变信号是能量信号。
A.错误
B.正确
正确答案:————
18.[判断题] 概率密度函数曲线下的面积等于2 。
A.错误
B.正确
正确答案:————
19.[判断题] 判断题1概率分布函数是概率密度函数的导数。（）
A.错误
B.正确
正确答案:————
20.[判断题] 判断题8 为了避免混迭以便采样后仍能准确地恢复原信号，采样频率 fS 必须大于信号最高频率 fC的0.5倍，即 fS ＞0.5fC，这就是采样定理。（ ）
A.错误
B.正确
正确答案:————

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《测试技术基础》东大19秋在线平时作业123