题目内容

A/An( )pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.

A. injector
B. positive displacement
C. centrifugal
D. centripetal

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Which of the listed pumps is NOT a positive displacement pump?( )

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

atomization

aluminumalloy

synchroscope