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單項(xiàng)選擇題

The （） discharge a nearly constant amount of liquid regardless of pressure.

A.mixed-flow pump
B.axial-flow pump
C.centrifugal pump
D.displacement pump

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單項(xiàng)選擇題

Sediment collects in a tubular purifier （）.

A.on top cover
B.on sides of bowl
C.in drain line on the discs
D.on the discs

單項(xiàng)選擇題

In an oil cooler circulated by sea water, the oil is at a larger pressure the result being that any leak in the cooler will mean a loss of （）.

A.oil
B.sea water
C.refrigerant
D.fresh water