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單項(xiàng)選擇題

The （）is not a component of an oil separator.

A.sliding bowl bottom
B.gravity disc
C.separating disc
D.scum valve

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單項(xiàng)選擇題

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

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

單項(xiàng)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