单项选择题
（） 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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
