电路如图所示，20Ω电阻两端的电压U（ ）。
A: -40V
B: 20V
C: 30V
D: 10V
A: -40V
B: 20V
C: 30V
D: 10V
举一反三
- 电路如图所示，20Ω电阻两端的电压U（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/37eeb8f471b14fa39bd164502652fd41.png
- 电路如图所示，20Ω电阻两端的电压U（ ）。[img=284x170]17d606376d1a4fa.png[/img] A: -40V B: 20V C: 30V D: 10V
- 源电压放大倍数与电压放大倍数的关系是 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/2f6b445b00df4646b4edacaddd79a7af.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/4a0b0c930f934ecdb98e4d8b0c3fe3b4.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/d873f32851bf4ff196a2acbb25974b7e.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201904/a5405728c76b40e9ba50a7cf3fd20f7b.png" />
- 图示电路，20Ω电阻两端电压为（ ）。[img=202x160]1803bdd132be7b8.jpg[/img] A: 8 V B: 2 V C: 10 V D: 4V
- 杆AB的两端可分别沿水平，铅直滑道运动，已知B端的速度为v<sub>B</sub>，则图示瞬时B点相对于A点的速度为___________。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/94cd2eb3fc9b437fa63cd22c2319a049.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/4d1e266b04924baa9e49e920a3d43bc9.png" /> B: v<sub>B</sub>sinq C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/8896f5b80f9d4131a7a2309a447dbc05.png" /> D: v<sub>B</sub>cosq