單項選擇題

The pressure head of a pump is given in the unit of （）.

A.kg
B.MPa
C.meter fluid column
D.None of the above is true

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單項選擇題

A gear pump belongs to （） according to its working principle.

A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps

單項選擇題

Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.

A.depending on
B.in relative to
C.regardless of
D.because of

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