通过对绕组绝缘电阻的测量，能判定绝缘材料的受潮、沾污或（）问题。
参考答案：绝缘缺陷
The old man was the only person on the spot（现场）, so the policeman asked him to _____ the facts as he remembered them.
A．set up
B．dig out
C． set down
D．keep out
淋证的诊断依据有哪些
