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單項(xiàng)選擇題

In order to accurately measure very low pressures, which of the instruments listed should be used?（）

A.Compound gage
B.Bonrdon tube
C.Manometer
D.Deadweight gage

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單項(xiàng)選擇題

Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of （）.

A.cavitation
B.water hammer
C.fluid friction
D.steam knock

單項(xiàng)選擇題

The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.

A.sub-cooled liquid
B.high temperature liquid
C.oil saturated liquid
D.superheated vapor

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