离线作业答案 发表于 2020-9-13 08:38:15

东大20秋学期《噪声与振动控制》在线平时作业2参考

20秋学期《噪声与振动控制》在线平时作业2
1.[单选题] .如果在室内距离声源5米处直达声的声压级是80dB，混响声的声压级是60分贝。若关闭声源，距离声源10m处的直达声的声压级是多少？（    ）

    A.40
    B.50
    C.60
    D.0
    答:——C——
2.[单选题] <img height="149" width="662" alt="" src="http://file.open.com.cn/ItemDB/88716/958b29d5-40bd-44ce-bba8-401098231a2e/20111149751130.JPG" />
    A.A
    B.B
    C.C
    D.D
    答:——A——
3.[单选题] .若一隔声构件上孔洞的面积为墙面积的1/100，那么其隔声量不会超过（）dB
    A.10
    B.20
    C.30
    D.40
    答:——B——
4.[单选题] <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span lang="EN-US" style="COLOR: black; FONT-FAMILY: 宋体"><img height="248" width="662" alt="" src="http://file.open.com.cn/ItemDB/88716/af5702d3-933f-46e7-90e0-71ef669ec7e9/201111492814450.JPG" /> </span></font></p>
    A.A
    B.B
    C.C
    D.D
    答:————
5.[单选题] <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="COLOR: black"><span style="POSITION: relative; TOP: 5pt; mso-text-raise: -5.0pt"><img height="248" width="662" alt="" src="http://file.open.com.cn/ItemDB/88716/127aa4c4-0d90-4d21-a558-f87ccca6f6de/201111410822980.JPG" /><v:shape id="_x0000_i1026" style="WIDTH: 39.75pt; HEIGHT: 18pt" o:ole="" type="#_x0000_t75"><font size="3"><font face="Times New Roman"> <v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image003.wmz"></v:imagedata></font></font></v:shape></span><o:p></o:p></span></p>
    A.300
    B.360
    C.240
    D.180
    答:————
6.[单选题] 多孔吸声材料的厚度增加一倍，最大吸声频率向低频移动（   ）个倍频程
    A.2
    B.1
    C.0.5
    D.1/3
    答:————
7.[单选题] <span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; 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"><span style="mso-spacerun: yes"> </span></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; 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">对于各向同性的声源，其指向性因数</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; 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"><span style="POSITION: relative; TOP: 5pt; mso-text-raise: -5.0pt"><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><v:shape id="_x0000_i1025" style="WIDTH: 12pt; HEIGHT: 15.75pt" o:ole="" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz"></v:imagedata></v:shape></span></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; 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">大小为（</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; 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"><span style="mso-spacerun: yes">   </span></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; 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>
    A.1
    B.2
    C.4
    D.8
    答:————
8.[单选题] <img height="248" width="662" alt="" src="http://file.open.com.cn/ItemDB/88716/884bbb1a-0376-4f4f-a5f0-6bc4a289200e/201111493216630.JPG" />
    A.A
    B.B
    C.C
    D.D
    答:————
9.[单选题] <img height="157" width="443" alt="" src="http://file.open.com.cn/ItemDB/88716/af005178-e328-4fbf-a8a8-0619473f8e06/2011114104621287.JPG" />
    A.A
    B.B
    C.C
    D.D
    答:————
10.[单选题]   <img height="39" width="486" alt="" src="http://file.open.com.cn/ItemDB/88716/fb00c3cf-49c9-449c-92ae-3a429758db81/201111410181993.JPG" />
    A.1
    B.10
    C.20
    D.100
    答:————
11.[单选题] <img height="123" width="563" alt="" src="http://file.open.com.cn/ItemDB/88716/062dc31f-33c9-4ce8-90d7-b11d81015e74/2011114102148959.JPG" />
    A.A
    B.B
    C.C    q761296021更多答案进ap5u.com
    D.D
    答:————
12.[单选题] <span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; 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">若已知</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; 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">A</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; 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">声级为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; 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">80<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><v:shape id="_x0000_i1025" style="WIDTH: 17.25pt; HEIGHT: 14.25pt" o:ole="" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1.MS-\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz"></v:imagedata></v:shape></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; 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">，问与其相对应的噪声评价曲线的号数是（</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; 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"><span style="mso-spacerun: yes">   </span></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; 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>
    A.80
    B.85
    C.75
    D.70
    答:————
13.[单选题] 基准声功率的大小是（   ）瓦
    A.1&times;10-12
    B.2&times;10-10
    C.2&times;10-6
    D. 2&times;10-5
    答:————
14.[单选题]   人耳的闻阈声压是（   ）N/㎡
    A.2&times;10-5
    B.2&times;10-4
    C.2&times;10-6
    D.2&times;10-3
    答:————
15.[多选题] 根据平均听力损失判定噪声性耳聋时，采用哪些频率下的听力损失值（   ）
    A.250Hz
    B.500 Hz
    C..1000 Hz
    D.2000 Hz
    答:————
16.[多选题] 噪声对人的危害程度与下列哪些因素有关（   ）
    A.噪声的强度
    B.频率
    C.接受时间
    D.人的身体素质
    答:————
17.[判断题] 当几列波同时在同一介质中传播时，它们是各自独立地进行的，与其它波的存在与否无关。（）
    A.错误
    B.正确
    答:————
18.[判断题] 对于隔声屏由于低频声的波长较长，屏后声影区相对高频声较小。（    ）
    A.错误
    B.正确
    答:————
19.[判断题] 横波是波动方向与振动方向平行的声波（   ）
    A.错误
    B.正确
    答:————
20.[判断题] 扩散衰减量的大小与声源声功率有关（   ）
    A.错误
    B.正确
    答:————
21.[判断题] 对于理想的隔声构件，完全不透声时，其透射系数为1 。（   ）
    A.错误
    B.正确
    答:————
22.[判断题] 声波产生时需要两个条件：声源和声场（   ）
    A.错误
    B.正确
    答:————
23.[判断题] 为提高隔声罩的隔声性能一般罩内粘贴吸声系数大的吸声材料。（    ）
    A.错误
    B.正确
    答:————
24.[判断题] <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="COLOR: black"><o:p><font face="Times New Roman" size="3"> </font></o:p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><span lang="EN-US" style="COLOR: black; mso-fareast-font-family: 'Times New Roman'"><span style="mso-list: Ignore"><span style="FONT: 7pt "Times New Roman""></span></span></span><span style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">房间常数表达式</span><span lang="EN-US" style="COLOR: black"><span style="mso-spacerun: yes">R=S&alpha;/ &alpha;       </span></span><span style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中，</span><span lang="EN-US" style="COLOR: black"><span style="POSITION: relative; TOP: 3pt; mso-text-raise: -3.0pt"><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"> S</v:shapetype><v:shape id="_x0000_i1025" style="WIDTH: 11.25pt; HEIGHT: 14.25pt" o:ole="" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz"></v:imagedata></v:shape></span></span><span style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">代表室内的总壁面面积。（</span><span lang="EN-US" style="COLOR: black"><span style="mso-spacerun: yes"></span></span><span style="COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</span><span lang="EN-US" style="COLOR: black"><o:p></o:p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US" style="COLOR: black"><o:p> </o:p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"> </p>
    A.错误
    B.正确
    答:————
25.[判断题] <p><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"> <img height="248" width="662" alt="" src="http://file.open.com.cn/ItemDB/88716/b90e4c82-b13d-4ea3-b191-9a295c47328c/2011114102610358.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:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype></p>
    A.错误
    B.正确
    答:————
26.[判断题] 声压是大气压力的变化量，随时间、地点而变化（   ）
    A.错误
    B.正确
    答:————
27.[判断题]   平均吸声系数表示房间壁面单位面积的平均吸声能力。它是一个相对的量，无单位。（）
    A.错误
    B.正确
    答:————
28.[判断题] 声线是声波的传播方向，在各向同性（均匀介质）媒质中，波阵面与声线平行（   ）
    A.错误
    B.正确
    答:————
29.[判断题] 采用驻波管法测量得出的吸声系数是漫入射时的吸声系数。（）
    A.错误
    B.正确
    答:————
30.[判断题]声强衰减系数是声压衰减系数的2倍（   ）
    A.错误
    B.正确
    答:————

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