单项选择题
The function of damper windings in a synchronous motor is to （）.
A.eliminate slippage B.provide excitation C.provide starting torque D.increase efficiency
单项选择题 To repair a small electrical motor that has been submerged in saltwater, you should （）.
单项选择题 A fuse that blows often should be replaced only with a fuse of （）.
单项选择题 A constant output voltage from an AC generator is maintained by the （）.
