单项选择题
Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the （）
A.manual position B.bus neutral position C.raise voltage position D.transfer position
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 （）
单项选择题 When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）
