A.0.6~0.7 B.0.7~0.8 C.0.95以上
A.直流信號(hào)對(duì)地短路 B.交流信號(hào)對(duì)地短路 C.直流信號(hào)對(duì)地?cái)嗦?br /> D.交流信號(hào)對(duì)地?cái)嗦?/p>
A.50Hz B.150~450Hz C.500Hz D.500~10000Hz