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單項(xiàng)選擇題

Every liquid has a pressure at which it will vaporize and this pressure varies with temperatureThe word “which” means （）.

A.a liquid
B.a pressure
C.a temperature
D.none of the above

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單項(xiàng)選擇題

A simple pumping system consists of a suction branch, a pump and （）.

A.a priming device
B.a discharge branch
C.a filter
D.a suction valve

單項(xiàng)選擇題

A(n) （） is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.

A.pump
B.engine
C.turbine
D.boiler

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