单项选择题
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
单项选择题 The frequency of the alternating current generated by a synchronous generator is governed by the speed and the（）
单项选择题 When two DC generators operate in parallel, they are protected against motorizing by（）
单项选择题 The correct phase rotation of a three-phase alternator can be checked with a（）