單項(xiàng)選擇題

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

你可能感興趣的試題

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

A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps