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單項(xiàng)選擇題

When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）

A.Glass
B.Bakelite
C.Soft iron
D.Aluminum

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單項(xiàng)選擇題

An ohmmeter can be used to measure（）

A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
D.power

單項(xiàng)選擇題

The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage （）.

A.droop
B.drop
C.dip
D.regulation

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