单项选择题
A.Wear rubber gloves and boots
B.Use only approved non-conducting tools
C.Ground the case of the machine before beginning any repairs
D.Open the supply circuits and tag the switches
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 （）
单项选择题 A vessel is equipped with two ships service generatorsGenerator #1 is rated at 900kw and generator #2 is rated at 600kw.During parallel operation, with a hotel load of 1000kw, what should be the kw load on generator #2 （）.