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單項(xiàng)選擇題

Dress up the （）.

A.keyway
B.shaft
C.valve
D.casing

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單項(xiàng)選擇題

A mixed-flow pump is a （） pump classified by the working principle.

A.self priming
B.positive displacement
C.reciprocating
D.impeller

單項(xiàng)選擇題

The （）pump is usually used as the bilge feed pump to an oily water separator.

A.turbine
B.screw
C.vane
D.ejector