單項(xiàng)選擇題

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

A.heat-resisting acrylic
B.heat-resisting aluminum
C.insulating varnish
D.insulating white lead

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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

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

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