题目内容
(请给出正确答案)
[主观题]
While the parallel operation, ____ must be used.
A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
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A.ammeter
B.voltmeter
C.synchroscope
D.A+B+C
第1题
A.in which
B.on which
C.to which
D.by which
第2题
A.a liquid
B.a pressure
C.a temperature
D.none of the above
第3题
A.eliminate slippage
B.provide excitation
C.provide starting torque
D.increase efficiency
第4题
A.excessive time required for warming-up
B.excessive freshwater corrosion
C.scale formation on the saltwater side
D.saltwater mixing with the freshwater
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