用摇表测量设备对地绝缘电阻时,通过被测电阻的电流是()。
A、直流;
B、交流;
C、整流直流;
D、逆变交流。
参考答案:A
IPCC probably does not ______.
A.analyse climate change information
B.record weather changes on its premises
C.predict what is to happen to the earth
D.collect weather date from many countries
实物展示台,也称视频展示台,不仅可以展示实物,还可以展示投影胶片。