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

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Electrical leads and insulation on a motor should be painted with（）.

A.heat-resisting acrylic
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C.insulating varnish
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The electrolyte in a lead-acid storage battery consists of distilled water and （）.

A.hydrogen chloride
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A circuit breaker and a fuse have a basic similarity in that they both （）.

A.can be reset to energize the circuit
B.should open the circuit when overloaded
C.will burn out when an over current flow develops
D.All of the above