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單項(xiàng)選擇題

The gear, screw, and vane pumps are all classified as （）.

A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps

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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

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