单项选择题

The electrolyte in a lead-acid storage battery consists of distilled water and （）.

A.hydrogen chloride
B.calcium chloride
C.sulfuric acid
D.muriatic acid

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单项选择题

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

单项选择题

An electrical device which prevents an action from occurring until all other required conditions are met is called a an （）.

A.limit
B.monitor
C.modulator
D.interlock