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單項選擇題

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

A.positive displacement
B.non-positive displacement
C.mixed-flow
D.axial-flow

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單項選擇題

（） are more suitable for large quantities at low pressure.

A.Reciprocating pumps
B.Rotary pumps
C.Centrifugal pumps
D.Gear pumps

單項選擇題

The various pumps and lines are （） to some extent so that each pump can act as an alternative for another.

A.interlocked
B.interconnected
C.interfered
D.interacted

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