单选题（） is provided to alternators, in the event of prime mover failure to ensure that the alternator does not act as a motor.AReverse current protectionBReverse power protectionCSynchronising deviceDFrequency meter
单选题
（） is provided to alternators, in the event of prime mover failure to ensure that the alternator does not act as a motor.
A
Reverse current protection
B
Reverse power protection
C
Synchronising device
D
Frequency meter
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