单项选择题
Voltage generated by most AC generators is fed from the machine to the bus by means of（）.
A.brushes on a commutator B.brushes on slip rings C.slip rings on a commutator D.direct connections from the stator
单项选择题 Electrical leads and insulation on a motor should be painted with（）.
单项选择题 The electrolyte in a lead-acid storage battery consists of distilled water and （）.
单项选择题 A circuit breaker and a fuse have a basic similarity in that they both （）.
