A gear pump belongs to _____ according to its working principle.

The function of a centrifugal pump double volute casing is to _____.

A reciprocating pump belongs to _____ according to its working principle.A.injector pumpsB

The gear pump belongs to the （) pump.A.positive displacementB.reciprocatingC.centrifugal

According to the passage, the writer _______.A．belongs to a high social classB．comes from

A centrifugal bilge pump requires priming _____.A.primarily to lubricate the shaft sealsB.

Language belongs to each one of us to the flower-seller ________ to th A) as much