单项选择题
A.electromagnetic field, revolving armature type
B.electromagnetic field, oscillatory armature type
C.armature, oscillatory electromagnet field type
D.armature, rotating electromagnetic field type
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 （）.
单项选择题 The energy consumed by an AC motor, as strictly reactive power, is （）