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

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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

單項(xiàng)選擇題

If both the “high level” and “l(fā)ow level” alarms come on for the same address of a centralized control console, the most likely problem is a/an （）.

A.sensor failure
B.failed alarm
C.low level
D.extremely high level