单项选择题
A.De-energize the applicable switchboard bus
B.Bypass the interlocks
C.Secure and tag the supply circuit breaker in the open position
D.Station a man at the circuit supply switch
单项选择题 Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component （）
单项选择题 The most common type of AC service generator found aboard ship is the stationary （）.
单项选择题 An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus （）