单项选择题
When securing an AC generator, you should FIRST （）.
A.open the generator circuit breaker B.switch the voltage regulator to “manual” C.decrease the field excitation to minimum D.reduce the load on the unit
单项选择题 Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the （）
单项选择题 The main purpose of an electric space heater installed in a large AC generator is to （）
单项选择题 A transformer in an electric circuit serves to （）
