單項選擇題

Dress up the （）.

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

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單項選擇題

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