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举一反三
【单选题】Passage Two Questions 66 to 70 are based on the following passage: If an agreement signed in Germany works out, travelers of this Asian city may one day be able to move from the downtown area to its n...
A.
It is difficult to see fingerprints with human eyes.
B.
There are special ways to recover a suspect’s fingerprints.
C.
Even a small part of a fingerprint is useful for identification
D.
Suspects usually try to avoid leaving their fingerprints at the scene.
【单选题】变压器的铁芯接地是为了防止变压器在运行或试验时，由于（）而在铁芯或其它金属构件上产生悬浮电位造成对地放电。所以铁芯及其它金属构件除穿心螺杆外，都必须接地。
A.
静电感应
B.
电磁感应
C.
磁势平衡
D.
感应电势