《电路及磁路》武汉理工大学20春作业一
电路及磁路_作业一1.[判断题] 理想电压源和理想电流源不可以进行等效变换。
奥鹏作业答案可以联系QQ 761296021
A.正确
B.错误
正确答案:——A——
2.[判断题] 基尔霍夫电流定律（KCL）和基尔霍夫电压定律（KVL）只适于线性电路而不适用于非线性电路。
A.正确
B.错误
正确答案:——B——
3.[判断题] 一阶电路的全响应，等于其稳态分量和暂态分量之和。
A.正确
B.错误
正确答案:——A——
4.[判断题] 电路中任意两个结点之间连接的电路统称为支路
A.正确
B.错误
正确答案:————
5.[判断题] 非关联参考方向是指电流的实际方向与参考方向相反。
A.正确
B.错误
正确答案:————
6.[判断题] 换路定律指出：电感两端的电压是不能发生跃变的，只能连续变化。
A.正确
B.错误
正确答案:————
7.[判断题] 电功率大的用电器，电功也一定大。
A.正确
B.错误
正确答案:————
8.[判断题] 电路等效变换时，如果一条支路的电流为零，可按短路处理。
A.正确
B.错误
正确答案:————
9.[判断题] 零状态响应是指电路中无外加激励电源，仅由动态元件初始储能所产生的响应。
A.正确
B.错误
正确答案:————
10.[判断题] 线性电路中电流和电压可用叠加定理计算，因此功率也可以用叠加定理计算。
A.正确
B.错误
正确答案:————
11.[判断题] 三要素法只能求解一阶电路中的电容上的电压和电感电流。
A.正确
B.错误
正确答案:————
12.[判断题] 支路电流法和回路电流法都是为了减少方程式数目而引入的电路分析法。
A.正确
B.错误
正确答案:————
13.[判断题] 叠加定理只适用于直流电路。
A.正确
B.错误
正确答案:————
14.[判断题] 单位阶跃函数除了在t=0处不连续，其余都是连续的。
A.正确
B.错误
正确答案:————
15.[判断题] 在电路等效变换时，如果一条支路的电流为零，可按短路处理。
A.正确
B.错误
正确答案:————
16.[判断题] u,i取非关联参考方向，则乘积-ui表示元件发出的功率。
A.正确
B.错误
正确答案:————
17.[判断题] 串联电路中，电阻大者，其消耗的电功率也大。
A.正确
B.错误
正确答案:————
18.[判断题] 应用结点电压法求解电路时，参考点可要可不要。
A.正确
B.错误
正确答案:————
19.[单选题] 叠加定理只适用于 。
A.交流电路
B.直流电路
C.线性电路
D.非线性电路
正确答案:————
20.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">在图2-6所示电路中,I</span><span style="font-size:12.0000pt; font-family:'宋体'; vertical-align:sub; ">X</span><span style="font-size:12.0000pt; font-family:'宋体'; ">为</span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">( )</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="252" height="144" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-5396.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.2A
B.5A
C.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="30" height="42" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-5407.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
D.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="27" height="42" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-5410.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
正确答案:————
21.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">某电路的图如图5所示，则下面哪个不是它的树_________</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="154" height="140" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-7268.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.（1,7,6,9）
B.（2,3,1,8） 无忧答案网q76129 6021
C.（8,9,4,6）
D.（2,3,4,6）
正确答案:————
22.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; line-height:150%; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">如图4所示，输入电阻Rab为_________。</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; line-height:150%; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="219" height="162" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6750.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; ">4</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6754.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
B.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; ">6</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6758.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
C.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; ">8</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6762.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
D.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">12</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6767.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
正确答案:————
23.[单选题] 若一阶电路的时间常数为1s，则零输入响应每经过1s降衰减为原来值的 。
A.50%
B.36.8%
C.25%
D.13.5%
正确答案:————
24.[单选题] 动态元件的初始储能在电路中产生的零输入响应中 。
A.仅有稳态分量
B.仅有暂态分量
C.既有稳态分量，又有暂态分量
D.不确定
正确答案:————
25.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">电路如图2所示，则该电路的输入阻抗为</span><span style="mso-spacerun:'yes'; text-decoration:underline ;font-size:12.0000pt; font-family:'宋体'; "> </span><span style="font-size:12.0000pt; font-family:'宋体'; ">。</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="215" height="134" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl06.files/dlycl06-6210.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.1Ω
B.2Ω
C.3Ω
D.4Ω
正确答案:————
26.[单选题] 已知空间有A、b两点，电压Uab=10V，a点电位为Va=4V，则b点电位Vb为 。
A.6V
B.－6V
C.14V
D.－14V
正确答案:————
27.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">在图<font face="Times New Roman">2</font><font face="宋体">电路中，电流源的功率为</font></span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'Times New Roman'; ">______</span><span style="font-size:12.0000pt; font-family:'宋体'; ">。</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="254" height="128" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-5788.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.吸收6W
B.发出6W
C.吸收4W
D.发出4W
正确答案:————
28.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:left; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">电路如图2-1所示，若电流源的电流I</span><span style="font-size:12.0000pt; font-family:'宋体'; vertical-align:sub; ">S</span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">＞1A,则电路的功率情况为</span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">( )</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="206" height="158" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-2887.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.电阻吸收功率，电流源和电压源供出功率
B.电阻与电流源吸收功率，电压源供出功率
C.电阻与电压源吸收功率，电流源供出功率
D.电阻无作用，电流源吸收功率，电压源供出功率
正确答案:————
29.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; line-height:150%; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">图所示电容元件的</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="153" height="22" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl01.files/dlycl01-6921.png"></span>，当<span style="font-size:12.0000pt; font-family:'宋体'; "><img width="34" height="42" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl01.files/dlycl01-6933.png"></span>s时<span style="font-size:12.0000pt; font-family:'宋体'; "><img width="30" height="22" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl01.files/dlycl01-6947.png"></span>等于<span style="mso-spacerun:'yes'; text-decoration:underline ;font-size:12.0000pt; font-family:'宋体'; "> </span><span style="font-size:12.0000pt; font-family:'宋体'; ">。</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; line-height:150%; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="99" height="112" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl01.files/dlycl01-6987.png"></span> <o:p></o:p>
A.3V
B.V
C.12V
D.V
正确答案:————
30.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; line-height:150%; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">电路如图2-9所示，电流源I</span><span style="font-size:12.0000pt; font-family:'宋体'; vertical-align:sub; ">S</span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">=2A(t≥0)，电容初始电压ｕ(0)=1V，则在t=3s时电容电压ｕ和电容电荷Q为</span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">( )</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; line-height:150%; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="278" height="195" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-6855.png"></span><span style="color:rgb(0,0,0); font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.4V,8C
B.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="28" height="42" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-6905.png"></span>,7C<span style="color:rgb(0,0,0); font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
C.2V,4C
D.-2V,4C
正确答案:————
31.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">若某元件的u-i特性曲线在任何时刻如图2-2所示，则此元件为</span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">( )</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="185" height="132" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-3429.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.线性、非时变电阻
B.线性、时变电阻
C.非线性、时变电阻
D.非线性、非时变电阻
正确答案:————
32.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; line-height:150%; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">如图7所示，用节点电压求出A点的电位为_________。</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; line-height:150%; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="158" height="160" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-8272.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; ">7</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-8276.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
B.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">8.4</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-8282.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
C.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">11</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-8287.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
D.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">13.2</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-8294.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
正确答案:————
33.[单选题] 已知接成Y形的三个电阻都是30Ω，则等效Δ形的三个电阻阻值为 。
A.全是10Ω
B.两个30Ω一个90Ω
C.全是90Ω
D.不确定
正确答案:————
34.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; line-height:150%; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">如图3所示，电路Rab为_________。</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; line-height:150%; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="271" height="145" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6271.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">18</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6276.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
B.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; ">9</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6280.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
C.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; ">3</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6284.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
D.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; ">2</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="17" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl05.files/dlycl05-6288.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
正确答案:————
35.[单选题] 已知空间有a、b两点，电压Uab=10V，a点电位为Va=4V，则b点电位Vb为 。
A.6V
B.－6V
C.14V
D.－14V
正确答案:————
36.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">如图2所示，电流源的功率为</span><span style="mso-spacerun:'yes'; text-decoration:underline ;font-size:12.0000pt; font-family:'宋体'; "> </span><span style="font-size:12.0000pt; font-family:'宋体'; ">。</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="175" height="187" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl06.files/dlycl06-7338.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.吸收12W
B.吸收48W
C.发出12W
D.发出48W
正确答案:————
37.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; line-height:150%; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">如图2-7所示二端网络的戴维南等效电路的两参数为</span><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">( )</span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; line-height:150%; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="290" height="128" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-5863.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="59" height="42" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-5866.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
B.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="54" height="42" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-5869.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
C.<p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="54" height="42" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl02.files/dlycl02-5872.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
D.5V5V
正确答案:————
38.[单选题] <p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:12.0000pt; font-family:'宋体'; ">电路图如图3所示，已知</span><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="61" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl06.files/dlycl06-6711.png"></span>，<span style="font-size:12.0000pt; font-family:'宋体'; "><img width="73" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl06.files/dlycl06-6753.png"></span>，<span style="font-size:12.0000pt; font-family:'宋体'; "><img width="77" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl06.files/dlycl06-6795.png"></span>，<span style="font-size:12.0000pt; font-family:'宋体'; "><img width="74" height="20" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl06.files/dlycl06-6837.png"></span>，则流过R3上的电流i为<span style="mso-spacerun:'yes'; text-decoration:underline ;font-size:12.0000pt; font-family:'宋体'; "> </span><span style="font-size:12.0000pt; font-family:'宋体'; ">。</span><span style="text-decoration:underline ;font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
<p class="p0" style="margin-bottom:0pt; margin-top:0pt; text-align:center; "><span style="font-size:12.0000pt; font-family:'宋体'; "><img width="285" height="142" src="http://wljy.whut.edu.cn//uploadfiles/word/dlycl06.files/dlycl06-6859.png"></span><span style="font-size:12.0000pt; font-family:'宋体'; "><o:p></o:p></span>
A.0.3A
B.0.6A
C.0.4A
D.0.2A
正确答案:————
39.[单选题] 在换路瞬间，下列说法中正确的是 。
A.电感电流不能跃变
B.电感电压必然跃变
C.电容电流必然跃变
D.电容电压必然跃变
正确答案:————
40.[单选题] 当电路中电流的参考方向与电流的真实方向相反时，该电流 。
A.一定为正值
B.一定为负值
C.不能肯定是正值或负值
D.为0
正确答案:————
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