单项选择题
Which of the following is NOT the advantages of the remote control and automation of engine operations?（）
A.Routine supervisory labor particularly the unproductive night-service labor is reduced
B.Engine mal-operation is automatically sensed and manned
C.The engine room need be manned at night in bad weather or close waters
D.Some remedial measures can be taken automatically
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The load rating of an AC generator is determined by the（）
A.internal heat it can withstand
B.load it can carry continuously
C.load it is capable of supplying
D.overload it can carry for a specified time only -
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The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）
A.full excitation
B.load
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When two DC generators operate in parallel, they are protected against motorizing by（）
A.blow out coils
B.governor relay
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