單項(xiàng)選擇題

Air compressor cylinder un-loaders enable the compressor to （）.

A.vary their speed according to temperature and load
B.start and come up to speed before air compression begins
C.change speed according to overload demands
D.reduce compressed air charge density

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單項(xiàng)選擇題

The movement of heat within a fluid, caused by the application of thermal energy, is called （）.

A.radiation
B.conduction
C.convection
D.condo-radiation

單項(xiàng)選擇題

A gate valve installed in a pipeline should be （）.

A.used in either the fully dosed or fully opened position
B.installed with the stem down
C.used for steam service only
D.used to throttle or regulate the flow of liquid

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