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单项选择题
A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps
单项选择题
A.positive displacement
B.ejector
C.centrifugal
D.air compressor
单项选择题
A.reciprocating pump
B.positive displacement pump
C.centrifugal pump
D.centripetal pump