單項選擇題Dress up the ().

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


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1.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

3.單項選擇題The ()pump is usually used as the emergency bilge pump.

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

4.單項選擇題When starting a reciprocating pump, the inlet valve should be ().

A.closed
B.opened fully
C.cracked open
D.partly open

5.單項選擇題When starting a centrifugal pump, the discharge valve should be ().

A.closed
B.opened fully
C.cracked open
D.partly open