东大电路原理X20春学期《电路原理》在线平时作业123
电路原理X20春学期《电路原理》在线平时作业1奥鹏作业答案可以联系QQ 761296021
1.[单选题] <div>图中,<span>L=20mH, C=50pF, R=1k</span><span>W</span>, Ù=10<span>Ð</span>0<sup>0</sup> V。求电路的电流<span>I为 (<span> ) mA </span>。</span></div><div>A I=<span>¥</span><sup><span> </span></sup><span> B I=10 C </span>其它</div><div></div><div><img height="102" width="134" alt="" src="http://file.open.com.cn/ItemDB/88702/d0c3fdc0-4970-4faf-a570-0ff90e197461/201112793159643.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——B——
2.[单选题] <div>如图空心变压器的输出的特性方程为<span>(<span> )</span>。</span></div><div>A u<sub>2</sub>=L<sub>1</sub>(di<sub>2</sub>/dt)-M(di<sub>1</sub>/dt), B u<sub>2</sub>=L<sub>2</sub>(di<sub>2</sub>/dt)-M(di1<sub>2</sub>/dt), C 其它</div><div></div><div><img style="WIDTH: 171px; HEIGHT: 115px" height="415" width="643" alt="" src="http://file.open.com.cn/ItemDB/88702/948c67ff-494d-4ffe-8e60-223e65cade26/201112791947501.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——B——
3.[单选题] <div align="left">图中所示为矩形脉冲,试求其象函数<span>F(S)为(<span> </span>)。</span></div><div align="left"> </div><div>A (1/S)(1-e<sup>-St0</sup>)<span> B 1/S C</span>其它</div><div><img height="131" width="170" alt="" src="http://file.open.com.cn/ItemDB/88702/beae6112-d65a-4803-86a2-cfbbfdf7f427/201112992615295.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——A——
4.[单选题] <div>图中,<span>L=20mH, C=50pF, R=1k</span><span>W</span>, Ù=10<span>Ð</span>0<sup>0</sup> V。电路的谐振频率<span>w</span><sub>0</sub>为<span>(<span> )</span>弧度/秒 。</span></div><div>A 10<sup>6<span> </span>其它</sup> B 159155 C </div><div></div><div><img height="102" width="134" alt="" src="http://file.open.com.cn/ItemDB/88702/bff4af68-3902-4a41-9709-bb8b45d899c1/201112792625588.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:————
5.[单选题] <div>图中,<span>L=10</span><span>m</span>H,<span>C=10</span><span>m</span>F,Ù=1<span>Ð</span>0<sup>0</sup> V。电路的电容电流有效值<span>I<sub>C</sub>为(<span> )</span>安。</span></div><div>A 10<sup>5<span> </span>其它</sup> B 0 C </div><div></div><div><img height="181" width="194" alt="" src="http://file.open.com.cn/ItemDB/88702/49688dad-52fa-409b-babc-30f228b1e1f1/201112792527836.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:————
6.[判断题] <div align="left">电流表<span>A</span><sub>1</sub>的读数为<span>5A, A</span><sub>2</sub>为<span>20A, A</span><sub>3</sub>为<span>25A,电流表A</span><sub>4</sub>的读数为<span>45A 。(<span> </span>)</span></div><div align="left"><span></span></div><div align="left"><span><img height="183" width="333" alt="" src="http://file.open.com.cn/ItemDB/88702/6cc1e6a6-bda7-4f8b-8b9d-2f36eaafe58d/2011126923513.JPG" /></span></div>
A.错误
B.正确
正确答案:————
7.[判断题] <div align="left">电路如图所示, <span>t<0</span>时电路已达稳态,t=0时开关<span>K由①扳向②,电压</span>u<sub>C</sub>(0)=4V 。<span>(<span> )</span></span></div><div align="left"><span><span><img height="205" width="372" alt="" src="http://file.open.com.cn/ItemDB/88702/75efb68a-b38b-4dde-9318-da1e3269f61b/2011128112922153.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
8.[判断题] 星形联接的三相电路可以是三线制也可以是四线制。( )
A.错误
B.正确
正确答案:————
9.[判断题] 己知:<span>U</span><sub>S</sub>=10V,R<sub>3</sub>=1Ω,R<sub>1</sub>=2Ω,R<sub>2</sub>=7Ω. 则<span>a点的电位</span>U<sub>a</sub>=-1V。<span>(<span> )</span></span>
<span><span><img style="WIDTH: 137px; HEIGHT: 106px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/c57e38a7-fab8-4309-8e5e-533dffb10b3d/2011124152259876.JPG" /></span></span>
A.错误
B.正确
正确答案:————
10.[判断题] 复阻抗Z的阻抗角反映了Z两端的电压和电流的相位差。( )
A.错误
B.正确
正确答案:————
11.[判断题] 正弦电路的平均功率P=UIcosj。( )
A.错误
B.正确
正确答案:————
12.[判断题] 串联谐振时,电感电压和电容电压相等UL=UC,外加电压等于电阻电压U=UR。( )
A.错误
B.正确
正确答案:————
13.[判断题] <div align="left">图中<span> R</span><sub>1</sub>=6Ω, R<sub>2</sub>=4 Ω, R<sub>3</sub>=3 Ω, U<sub>S1</sub>=12V, U<sub>S2</sub>=24V。则电流I<sub>2</sub>=-6A.(<span> )</span></div><div align="left"><span></span></div><div align="left"><span><img style="WIDTH: 249px; HEIGHT: 148px" height="177" width="344" alt="" src="http://file.open.com.cn/ItemDB/88702/11c37e79-b1ac-4015-bf4b-1955888dafca/2011124153745232.JPG" /></span></div>
A.错误
B.正确
正确答案:————
14.[判断题] F(S)=(S+8)/的原函数f(t)=1(t)( )。
A.错误
B.正确
正确答案:————
15.[判断题] <div align="left">电路中的开关断开已经很久,<em>t</em>=0时闭合开关,电压u<sub>1</sub>(0)=1V 。(<span> )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/cea2c96b-f8e4-4cba-8353-2fbf7514ea1b/2011128112757104.JPG" /></div>
A.错误
B.正确
正确答案:————
16.[判断题] 并联谐振是含有电感和电容的电路中的复导纳Y的虚部G=0时产生的。( )
A.错误
B.正确
正确答案:————
17.[判断题] <div align="left">图中<span> U</span><sub>S</sub>=-10V, R=10Ω, I<sub>S</sub>=1A。则电压源输出的电功率为<span>10W。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/7c2b430d-2879-4ed1-9203-04a315deac76/201112415514742.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
18.[判断题] R=15Ω, <span>L=0.3mH, C=0.2mF,U=5V,f=3*</span>10<sup>4</sup>Hz .电压U<sub>C</sub>=3.95V <sub> </sub>。(<span><span> </span>)</span>
<span></span>
<span><img alt="" width="255" height="166" src="http://file.open.com.cn/ItemDB/88702/261464b7-1261-4404-9895-e659518cfe55/2011126989304.JPG" /></span>
A.错误
B.正确
正确答案:————
19.[判断题] <div align="left">图中<span> U</span><sub>S</sub>=10V, R=10Ω, I<sub>S</sub>=1A。则电流源输出的电功率为<span>20W。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/d707cb7e-58f2-4abb-951e-12c7e6d05d1f/2011124155236855.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
20.[判断题] <div align="left">图中<span> U</span><sub>S</sub>=10V, R=10Ω, I<sub>S</sub>=-1A。则电压<span>U=0V 。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/640b4b05-1d11-44a5-9d3e-e304477ff20d/201112415499864.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
电路原理X20春学期《电路原理》在线平时作业2
1.[单选题] <div>图中,<span>L=20mH, C=50pF, R=1k</span><span>W</span>, Ù=10<span>Ð</span>0<sup>0</sup> V。电路的谐振频率<span>w</span><sub>0</sub>为<span>(<span> )</span>弧度/秒 。</span></div><div>A 10<sup>6<span> </span>其它</sup> B 159155 C </div><div></div><div><img height="102" width="134" alt="" src="http://file.open.com.cn/ItemDB/88702/bff4af68-3902-4a41-9709-bb8b45d899c1/201112792625588.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——A——
2.[单选题] <div align="left">8-1 图中所示电路<span>L=0.2H,R=2</span><span>Ω</span>,求冲击响应<span>i为(<span> </span>) </span>。</div><div align="left"> </div><div>A 5e<sup>-t</sup>1(t)A<span> B 0 C</span>其它</div><div><img alt="" width="202" height="122" src="http://file.open.com.cn/ItemDB/88702/09a8c6fb-3dad-4685-8541-2e7b761a80af/201112992157242.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——A——
3.[单选题] <div>图中<span>t</span><span>³</span>0时<span>u<sub>c</sub>(t)为(<span> )</span>。</span></div><div>A u(t)=12e<sup>-0.25t </sup><span> B u(t)=12-12e<sup>-0.25t</sup> C </span>其它</div><div><img height="227" width="314" alt="" src="http://file.open.com.cn/ItemDB/88702/919e2371-76e2-479e-aca1-ad80c7ff1b91/20111281118398.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——A——
4.[单选题] <div>图中<span>t</span><span>³</span>0时<span>i<sub>L</sub>(t) 为(<span> )</span>。</span></div><div>A i<sub>L</sub>(t)=3e<sup>-4t </sup><span> B i<sub>L</sub>(t)=3-3e<sup>-4t</sup> C </span>其它</div><div><img height="214" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/9fc324a9-266f-4a36-8cf1-c0cea1adc304/201112811174784.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:————
5.[单选题] <div align="left">图中所示电路<span>C=0.1F,R=10</span><span>Ω</span>,求冲击响应<span>i为(<span> </span>) </span>。</div><div align="left"> </div><div>A 0.1<span>d</span>(t)-0.1e<sup>-t</sup>1(t)A<span> B -0.1e<sup>-t</sup>1(t)A C</span>其它</div><div><img alt="" width="202" height="122" src="http://file.open.com.cn/ItemDB/88702/312bac90-d018-482a-b489-7ba3ba1b438b/201112992414229.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:————
6.[判断题] <div align="left">R=15<span>Ω</span>, <span>L=0.3mH, C=0.2mF,U=5V,f=3</span><span>*</span>10<sup>4</sup>Hz .电流i=0.3Sin(18.8495t-34<span>°</span>)A <sub> </sub>。(<span><span> </span>)</span></div><div align="left"><span></span></div><div align="left"><span><img alt="" width="255" height="166" src="http://file.open.com.cn/ItemDB/88702/073de356-97d6-4bd9-b887-6f07bcf59451/20111269713662.JPG" /></span></div>
A.错误
B.正确
正确答案:————
7.[判断题] <div align="left">图中电位<span>U<sub>b</sub>=4.4V。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="212" width="350" alt="" src="http://file.open.com.cn/ItemDB/88702/c60693a4-5af3-4277-8a14-8ddfdf221eb6/201112510205373.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
8.[判断题] 含非正弦的非线性电路中的电压或电流的求解可以直接应用叠加定理求解。( )
A.错误
B.正确
正确答案:————
9.[判断题] 图中电位Ua=-4.4V 。( )
A.错误
B.正确
正确答案:————
10.[判断题] 正弦电路的平均功率P=UIcosj。( )
A.错误
B.正确
正确答案:————
11.[判断题] <div align="left">图中<span> U</span><sub>S</sub>=10V, R=10Ω, I<sub>S</sub>=-1A。则电流<span>I=1A 。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/f412761b-83ab-4bc6-be85-c3dd7607f225/201112415506944.JPG" /></span></span></div>
A.错误
B.正确 答案可以联系QQ 7 612 9 6021
正确答案:————
12.[判断题] 正弦电路的平均功率P=UIcosj。( )
A.错误
B.正确
正确答案:————
13.[判断题] <div align="left">已知 R<sub>1</sub>=<span>R</span><sub>2</sub>=1Ω, <span>L</span><sub>1</sub>=1H, <span>C=1</span>F。若激励是 <span>d</span>(<span>t)</span>,响应是u<sub>2</sub>(<span>t)</span>,网络函数H(S)=1/(S<sup>2</sup>+2S+2)(<span><span> </span>)。</span></div><div align="left"> <img height="179" width="330" alt="" src="http://file.open.com.cn/ItemDB/88702/0d102e5a-530c-4612-84e1-4fa5c3c719d7/201112993223320.JPG" /></div>
A.错误
B.正确
正确答案:————
14.[判断题] <div align="left">电路中的开关断开已经很久,<em>t</em>=0时闭合开关,电压u<sub>1</sub>(0)=1V 。(<span> )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/cea2c96b-f8e4-4cba-8353-2fbf7514ea1b/2011128112757104.JPG" /></div>
A.错误
B.正确
正确答案:————
15.[判断题] <div>图中复阻抗<span>Y=1/R+1/(j</span><span>w</span>L)+j<span>w</span>C。<span>(<span> )</span></span></div><div><span><span></span></span></div><div><span><span><img height="226" width="420" alt="" src="http://file.open.com.cn/ItemDB/88702/8899879a-b6bf-49e6-ac99-4269159bccdb/20111269119293.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
16.[判断题] <div align="left">图中电流<span>I=1.5A。(<span> </span>)</span></div><div align="left"><span></span><div align="left"><span></span></div><div align="left"><span></span></div></div><div align="left"><span><img style="WIDTH: 212px; HEIGHT: 151px" height="212" width="350" alt="" src="http://file.open.com.cn/ItemDB/88702/74900dc9-93a4-414e-8388-619a0714026b/2011125102335866.JPG" /></span></div>
A.错误
B.正确
正确答案:————
17.[判断题]Y22等于双口网络输入端开路时的输出导纳。 ( )N
A.错误
B.正确
正确答案:————
18.[判断题] <div align="left">图中<span> R</span><sub>1</sub>=6Ω, R<sub>2</sub>=4 Ω, R<sub>3</sub>=3 Ω, U<sub>S1</sub>=12V, U<sub>S2</sub>=24V。则电阻<span>R<sub>1</sub>消耗的电功率为24W。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="344" alt="" src="http://file.open.com.cn/ItemDB/88702/736e08f0-0f8e-4743-ae0f-ff2f1c91a6cb/2011124154127130.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
19.[判断题] <div align="left">图中电流<span>I<sub>2</sub>=2A。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="238" width="337" alt="" src="http://file.open.com.cn/ItemDB/88702/e5f1a4c9-d33a-4178-a89b-d3cadcbc1b0e/2011125101250779.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
20.[判断题] <div align="left">图中<span> R</span><sub>1</sub>=6Ω, R<sub>2</sub>=4 Ω, R<sub>3</sub>=3 Ω, U<sub>S1</sub>=12V, U<sub>S2</sub>=24V。则电流<span>I</span><sub>1 </sub>=2A.(<span> )</span></div><div align="left"><span></span></div><div align="left"><span><img style="WIDTH: 216px; HEIGHT: 135px" height="177" width="344" alt="" src="http://file.open.com.cn/ItemDB/88702/a7e24506-d0fa-4118-9c51-96843d0062a2/2011124153614308.JPG" /></span></div>
A.错误
B.正确
正确答案:————
电路原理X20春学期《电路原理》在线平时作业3
1.[单选题] <div>图中<span>t</span><span>³</span>0时<span>i<sub>L</sub>(t) 为(<span> )</span>。</span></div><div>A i<sub>L</sub>(t)=3e<sup>-4t </sup><span> B i<sub>L</sub>(t)=3-3e<sup>-4t</sup> C </span>其它</div><div><img height="214" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/9fc324a9-266f-4a36-8cf1-c0cea1adc304/201112811174784.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——A——
2.[单选题] <div>如图理想变压器的电压方程为<span>(<span> )</span>。</span></div><div>A u<sub>1</sub>=nu<sub>2 </sub>,<span> B u<sub>1</sub>=-nu<sub>2 </sub>, C </span>其它</div><div></div><div><img style="WIDTH: 194px; HEIGHT: 106px" height="226" width="369" alt="" src="http://file.open.com.cn/ItemDB/88702/270dd319-379b-4e2d-949d-517aad98b68a/201112792128815.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——A——
3.[单选题] <div>如图空心变压器的输出的特性方程为<span>(<span> )</span>。</span></div><div>A u<sub>2</sub>=L<sub>1</sub>(di<sub>2</sub>/dt)-M(di<sub>1</sub>/dt), B u<sub>2</sub>=L<sub>2</sub>(di<sub>2</sub>/dt)-M(di1<sub>2</sub>/dt), C 其它</div><div></div><div><img style="WIDTH: 171px; HEIGHT: 115px" height="415" width="643" alt="" src="http://file.open.com.cn/ItemDB/88702/948c67ff-494d-4ffe-8e60-223e65cade26/201112791947501.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:——B——
4.[单选题] <div>如图理想变压器的电流方程为<span>(<span> )</span>。</span></div><div>A i<sub>1</sub>=ni<sub>2 </sub>,<span> B i<sub>1</sub>=-(1/n)i<sub>2 </sub>, C </span>其它</div><div><img style="WIDTH: 246px; HEIGHT: 117px" height="226" width="369" alt="" src="http://file.open.com.cn/ItemDB/88702/99c1e4db-2dd5-4327-81b3-2a82391fa84f/20111279233270.JPG" /></div><div></div>
A.A
B.B
C.C
D.D
正确答案:————
5.[单选题] <div>图中<span>t</span><span>³</span>0时<span>u<sub>c</sub>(t)为(<span> )</span>。</span></div><div>A u(t)=12e<sup>-0.25t </sup><span> B u(t)=12-12e<sup>-0.25t</sup> C </span>其它</div><div><img height="227" width="314" alt="" src="http://file.open.com.cn/ItemDB/88702/919e2371-76e2-479e-aca1-ad80c7ff1b91/20111281118398.JPG" /></div>
A.A
B.B
C.C
D.D
正确答案:————
6.[判断题] <div align="left">图示电路,t=0 时将开关<span>K闭合</span>,<span>t<0</span>时电路已达稳态,电压u<sub>c</sub>(0)=10V 。<span>(<span> )</span></span></div><div align="left"> <img height="179" width="347" alt="" src="http://file.open.com.cn/ItemDB/88702/8ba5edc6-2187-486e-bace-7b153849ee21/201112811255551.JPG" /></div>
A.错误
B.正确
正确答案:————
7.[判断题] 理想变压器具有变电压功能,U1与U2之比等于匝数比n2。( )
A.错误
B.正确
正确答案:————
8.[判断题] <div align="left">电路如图所示, <span>t<0</span>时电路已达稳态,t=0时开关<span>K由①扳向②,电压</span> u<sub>R</sub>(0)=4V 的初始值。<span>(<span> )</span></span></div><div align="left"><span><span><img height="205" width="372" alt="" src="http://file.open.com.cn/ItemDB/88702/3879c225-0e2d-4d90-957b-e8389238c2d9/201112811306967.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
9.[判断题] 滤波器是利用电感和电容的频率特性实现滤掉某些频率波形的设备。( )
A.错误
B.正确
正确答案:————
10.[判断题] <div align="left">电路中的开关断开已经很久,<em>t</em>=0时闭合开关,电流i<sub>L</sub>(0)=1A 。(<span> )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/2ac95e58-1679-4890-9afb-ebb5764b985a/201112811278914.JPG" /></div>
A.错误
B.正确
正确答案:————
11.[判断题] 正弦电路的平均功率P=UIcosj。( )
A.错误
B.正确
正确答案:————
12.[判断题] <div align="left">已知 R=1Ω, <span>C=1F, a=2</span>。 e(t)=e<sup>-at</sup>1(t)V,时的u<sub>C</sub>(t)=e<sup>-t </sup>1(t)V(<span><span> </span>)。<img height="122" width="222" alt="" src="http://file.open.com.cn/ItemDB/88702/f155f4eb-0dc1-44f8-864a-dfff8c26ea09/201112993026364.JPG" /></span></div>
A.错误
B.正确
正确答案:————
13.[判断题] <div align="left">电路中的开关断开已经很久,<em>t</em>=0时闭合开关,电流i<sub>1</sub>(0)=1A 。(<span> )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/32b0cb26-3083-436e-b92c-78d3fe8431db/2011128112628710.JPG" /></div>
A.错误
B.正确
正确答案:————
14.[判断题] <div align="left">图中<span>70V电压源发出的功率P<sub>70</sub>=420W。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="238" width="337" alt="" src="http://file.open.com.cn/ItemDB/88702/cc3ee81b-3448-42e8-b386-73cd494359ba/2011125101518472.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
15.[判断题] R=15Ω, <span>L=0.3mH, C=0.2mF,U=5V,f=3*</span>10<sup>4</sup>Hz .电压U<sub>C</sub>=3.95V <sub> </sub>。(<span><span> </span>)</span>
<span></span>
<span><img alt="" width="255" height="166" src="http://file.open.com.cn/ItemDB/88702/261464b7-1261-4404-9895-e659518cfe55/2011126989304.JPG" /></span>
A.错误
B.正确
正确答案:————
16.[判断题] Z21等于双口网络输出端短路时的转移阻抗。( )
A.错误
B.正确
正确答案:————
17.[判断题] <div align="left">图中<span> U</span><sub>S</sub>=10V, R=10Ω, I<sub>S</sub>=-1A。则电流<span>I=1A 。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/f412761b-83ab-4bc6-be85-c3dd7607f225/201112415506944.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
18.[判断题] <div>己知:<span>U</span>S=30V,R<sub>3</sub>=1Ω,R<sub>1</sub>=2Ω,R<sub>2</sub>=7Ω. 则电压U<sub>co</sub>=21V。<span>(<span> )</span></span></div><div><span><span></span></span></div><div><span><span><img style="WIDTH: 175px; HEIGHT: 132px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/38c9abf6-9781-4137-951b-6753c7366c40/2011124153251161.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
19.[判断题] <div>己知:<span>U</span><sub>S</sub>=30V,R<sub>3</sub>=1Ω,R<sub>1</sub>=2Ω,R<sub>2</sub>=7Ω. 则电压U<sub>ab</sub>=-30V。<span>(<span> )</span></span></div><div><span><span></span></span></div><div><span><span><img style="WIDTH: 170px; HEIGHT: 121px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/f4d32a8c-379b-4db3-8339-6fd0622d9461/2011124153037391.JPG" /></span></span></div>
A.错误
B.正确
正确答案:————
20.[判断题] 非正弦电路的谐波阻抗是随着谐波的频率不同而变化的。( )
A.错误
B.正确
正确答案:————
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