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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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
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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 （）.

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B.number of turns of wire in the armature coil
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