东大20秋学期《数字电子技术基础Ⅰ》在线平时作业2参考
20秋学期《数字电子技术基础Ⅰ》在线平时作业21.[单选题] 用二进制异步计数器从0做加法,计到十进制数178,则最少需要()个触发器。
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A.2
B.6
C.7
D.8
答:——D——
2.[单选题] 由555定时器构成的施密特触发器,改变控制电压Vco时,则( )。
A.改变输出Uo的幅值
B.改变低电平的UOL数值
C.改变高电平UOH的数值
D.<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt">改变回差电压</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman","serif"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体"><span style="mso-spacerun: yes"> <img height="22" width="28" alt="" src="http://file.open.com.cn/ItemDB/98839/31ff845d-de5d-4b7d-bc49-71ed0cad64e3/201192420272430.jpg" /></span></span>
答:——D——
3.[单选题] 一只四输入端与非门,使其输出为0的输入变量取值组合有__________种。
A.15
B.8
C.7
D.1
答:——D——
4.[单选题] 一位8421BCD码译码器的数据输人线与译码输出线组合是____ 。
A.4:16
B.1:10
C.4:10
D.2:4
答:————
5.[单选题] <span style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">逻辑函数<img height="19" width="81" alt="" src="http://file.open.com.cn/ItemDB/98839/0be7bf17-2652-4ea8-9fd1-801653a87b6c/201192311357308.jpg" /><span style="FONT-SIZE: 10.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">的对偶式<img height="22" width="72" alt="" src="http://file.open.com.cn/ItemDB/98839/0be7bf17-2652-4ea8-9fd1-801653a87b6c/201192311418355.jpg" /></span></span>
A.<p><img height="30" width="96" alt="" src="http://file.open.com.cn/ItemDB/98839/0be7bf17-2652-4ea8-9fd1-801653a87b6c/201192311756300.jpg" /></p>
B.<img height="37" width="120" alt="" src="http://file.open.com.cn/ItemDB/98839/0be7bf17-2652-4ea8-9fd1-801653a87b6c/2011923117312.jpg" />
C.<img height="34" width="106" alt="" src="http://file.open.com.cn/ItemDB/98839/0be7bf17-2652-4ea8-9fd1-801653a87b6c/201192311640141.jpg" />
D.<img height="30" width="81" alt="" src="http://file.open.com.cn/ItemDB/98839/0be7bf17-2652-4ea8-9fd1-801653a87b6c/20119231176236.jpg" />
答:————
6.[单选题] <span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">欲使</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'; 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">D</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">触发器按<img height="29" width="71" alt="" src="http://file.open.com.cn/ItemDB/98839/3d86412b-f96f-44f0-8122-243de0665632/201192420103483.jpg" /></span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman','serif'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-size: 12.0pt; 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"> </v:shapetype></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">工作,应使输入</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'; 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">D= ( )</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">。</span>
A.0
B.1
C.Q
D.<div><img height="25" width="23" alt="" src="http://file.open.com.cn/ItemDB/98839/3d86412b-f96f-44f0-8122-243de0665632/201192420119443.jpg" /></div>
答:————
7.[单选题] 下列四个数中与十进制数(163)10不相等的是()。
A.(A3)16
B.(10100011)2
C.(000101100011)8421BCD
D.(100100011)8
答:————
8.[单选题] 在下列触发器中,有约束条件的是( )
A.主从JKFF
B.主从DFF
C.同步RSFF
D.边沿DFF
答:————
9.[单选题] 以下能正确得到TTL噪声容限的等式是()。
A.UNH=UOHmin-UIHmax
B.UNH=UOHmax-UIHmin
C.UNL=UILmin-UOLmin
D.UNL=UILmax-UOLmax
答:————
10.[单选题] <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; mso-char-indent-count: -1.5"><font size="3"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">由</span><span lang="EN-US"><font face="Times New Roman">555</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">定时器构成的单稳态触发器,若电源电压为</span><span lang="EN-US"><font face="Times New Roman">Vcc=+6V</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">,则当暂稳态结束时,定时电容</span><span lang="EN-US"><font face="Times New Roman">C</font></span><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">上的电压<img alt="" src="file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/Tencent/Users/709940092/QQ/WinTemp/RichOle/JY19M29AP4B}IK2ES])5XGU.jpg" /></span></font><font size="3"><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">(</span><font face="Times New Roman"> </font><span style="FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">)。</span></font></p>
A.6V
B.0V
C.2V
D.4V
答:————
11.[单选题] 半导体E2PROM,写入的内容,可以通过_____擦除。( )
A.紫外线照射
B.电信号
C.口令
D.DOS命令
答:————
12.[单选题] 将一个时间上连续变化的模拟量转换为时间上离散的模拟量的过程为( )
A.采样
B.量化
C.保持
D.编码
答:————
13.[单选题] 一个无符号4位权电阻DAC,最低位处得电阻为40K欧姆,则最高位处电阻为( )。
A.4K欧姆
B.5K欧姆
C.10K欧姆
D.20K欧姆
答:————
14.[单选题] <v:shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"><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:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; TEXT-ALIGN: left; mso-layout-grid-align: none; mso-char-indent-count: -1.5" align="left"><v:shape id="_x0000_s1026" style="MARGIN-TOP: 23.4pt; Z-INDEX: -1; LEFT: 0px; MARGIN-LEFT: 279pt; WIDTH: 155.15pt; POSITION: absolute; HEIGHT: 93.6pt; TEXT-ALIGN: left" wrapcoords="-119 0 -119 21438 21600 21438 21600 0 -119 0" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtmlclip1\01\clip_image001.png"></v:imagedata><w:wrap type="tight"></w:wrap></v:shape><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'"><font face="Times New Roman"></font>如图所示电路,开关</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">A</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">、</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">断开为</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">0</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">,接通为</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">1</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">,灯</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">F</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">亮为</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">1</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">,灭为</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">0</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">,灯</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">F</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">与开关</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">A</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">、</span><span lang="EN-US" style="FONT-SIZE: 12pt"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">的逻辑关系为(</span><span lang="EN-US" style="FONT-SIZE: 12pt"><span style="mso-spacerun: yes"><font face="Times New Roman"></font></span></span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'">)</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; TEXT-ALIGN: left; mso-layout-grid-align: none; mso-char-indent-count: -1.5" align="left"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'"><img height="117" width="228" alt="" src="http://file.open.com.cn/ItemDB/98839/9cf61851-ca47-47e5-89a0-119d255250e4/201192312028369.jpg" /></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; TEXT-ALIGN: left; mso-layout-grid-align: none; mso-char-indent-count: -1.5" align="left"><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 'Times New Roman'"></span><span lang="EN-US" style="FONT-SIZE: 12pt"><o:p></o:p></span></p>
A.F=AB
B.<img height="28" width="61" alt="" src="http://file.open.com.cn/ItemDB/98839/9cf61851-ca47-47e5-89a0-119d255250e4/2011923115858616.jpg" />
C.F=A+B
D.<img height="28" width="77" alt="" src="http://file.open.com.cn/ItemDB/98839/9cf61851-ca47-47e5-89a0-119d255250e4/2011923115710363.jpg" />
答:————
15.[单选题] 采用四位比较器(74LS85)对两个四位数比较时,先比较____ 位
A.最低
B.次高
C.次低
D.最高
答:———— 东师答案q16478616401 或请进 ap5u.com
16.[单选题] 二极管的关断时间是( )
A. td+ts
B. ts+tf
C.tf+tr
D.tr+ts
答:————
17.[单选题] 某存储器具有8根地址线和8根双向数据线,则该存储器的容量为______。
A.8×3
B.8K×8
C.256×8
D.256×256
答:————
18.[单选题] 下列逻辑电路中为时序逻辑电路的是
A.变量译码器
B.加法器
C.数码寄存器
D.数据选择器
答:————
19.[单选题] 当74LS148的输入端按顺序输入11011101时,输出为()。
A.101
B.010
C.001
D.110
答:————
20.[单选题] 由555定时器构成的单稳态触发器,改变控制电压Vco时,则可改变( )。
A.输出脉冲的幅值
B.输出脉冲的周期
C.输出脉冲的宽度
D.对输出脉冲无影响
答:————
21.[判断题] 若要实现一个可暂停的一位二进制计数器,控制信号A=0计数,A=1保持,可选用T触发器,且令T=A。
A.错误
B.正确
答:————
22.[判断题] A/D转换过程中,必然会出现量化误差。
A.错误
B.正确
答:————
23.[判断题] 同步时序电路具有统一的时钟CP控制
A.错误
B.正确
答:————
24.[判断题] A/D转换过程中,必然会出现量化误差。
A.错误
B.正确
答:————
25.[判断题] D触发器的特征方程Qn+1=D,而与Qn无关,所以,D触发器不是时序电路。
A.错误
B.正确
答:————
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