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單項(xiàng)選擇題

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

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A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter methodTherefore, the meters should be connected with（）.
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D.the ammeter in parallel and the voltmeter in series with the resistance

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