单项选择题
A.overload condition of 5 % will trip the motor off the line immediately
B.overload condition will be indicated visually in the machinery space
C.motor running indicator will begin to flash "on" and "off" in response to the sustained overload condition
D.standby steering pump will start automatically and come on the line
单项选择题 When there is a fire in a large electric motor, normally the very FIRST step is to （）
单项选择题 When working on a high voltage circuit, you should always have another person present with you.This person should have a good working knowledge of （）
单项选择题 An emergency generator, driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once every （）