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單項(xiàng)選擇題

（） handle and instruments are on the front.

A.open
B.open front type
C.live front type
D.None of the above

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單項(xiàng)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

單項(xiàng)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