单项选择题

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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单项选择题
A gear pump belongs to （） according to its working principle.

A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
单项选择题
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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