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單項選擇題

The （）pump is usually used as the lubricating oil pump.

A.turbine
B.screw
C.vaneejector
D.centrifugal

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單項選擇題

The reciprocating pump can’t draw water from a tank may be caused by （）.

A.leaky pipe
B.opened inlet valve
C.too much water in tank
D.None of the above

單項選擇題

（）sometimes called filter, is a device designed to prevent the passage of unwanted solids into the system.

A.Steam trap
B.Check valve
C.Separator
D.Strainer

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