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單項選擇題

The （） is a crystal which, under pressure, produces an electric current which varies with the pressure.

A.alternator
B.glass thermometer
C.burdon tube
D.piezoelectric pressure transducer

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單項選擇題

Remote control means that （）.

A.the system is manned manually
B.the system is situated remotely from the operator
C.the system is controlled automatically
D.all the above

單項選擇題

Switchboards may be of the dead-front type in which all live parts are installed behind （） and only the operation handles and instruments are on the front.

A.the capstan
B.the collector
C.the panels
D.the surface