电容器在充电和放电过程中,充放电电流与电容器两端电压的变化率成正比()
查看答案
下图表示的是双绕组变压器、自耦变压器、电抗器(从左到右)分别为()
A-<img src=/resource/major/skill/test/import/27142/la4e1021_a.png>
B-<img src=/resource/major/skill/test/import/27142/la4e1021_b.png>
C-<img src=/resource/major/skill/test/import/27142/la4e1021_c.png>
D-<img src=/resource/major/skill/test/import/27142/la4e1021_d.png>
电容器组运行的环境温度不得超过40℃()
A. 正确
B. 错误
通电导体在磁场中向下运动,电源的正、负极和磁铁的N、S极标注正确的是()
A-<img src=/resource/major/skill/test/import/27142/la3e2008_a.png>
B-<img src=/resource/major/skill/test/import/27142/la3e2008_b.png>
C-<img src=/resource/major/skill/test/import/27142/la3e2008_c.png>
D-<img src=/resource/major/skill/test/import/27142/la3e2008_d.png>
用两只功率表、三只电流表测量一台三相变压器空载损耗的试验接线图的是()
A-<img src=/resource/major/skill/test/import/27142/je3e4007_a.png>
B-<img src=/resource/major/skill/test/import/27142/je3e4007_b.png>
C-<img src=/resource/major/skill/test/import/27142/je3e4007_c.png>
D-<img src=/resource/major/skill/test/import/27142/je3e4007_d.png>