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單項(xiàng)選擇題

As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.

A.circular
B.elliptical
C.rectangular
D.hexagon

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單項(xiàng)選擇題

Throttling in the （） line of a centrifugal pump involves the risk of the pump cavitation.

A.suction
B.exhaust
C.pressure
D.discharge

單項(xiàng)選擇題

A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.

A.draw the liquid in；force the liquid out
B.force the liquid out；draw the liquid in
C.suction；draw
D.deliver；outlet

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