单项选择题

The function of a rectifier is similar to that of a （）.

A.trap
B.regulating valve
C.check valve
D.filter

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单项选择题
Electrical circuits are protected against overheating by means of a an （）.

A.circuit breaker
B.amplifier
C.diode
D.capacitor
单项选择题
Routine maintenance of lead acid batteries should include （）.

A.keeping the terminals clean
B.coating cable connections with petroleum jelly
C.maintaining a trickle charge
D.All of the above
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