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Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?（）
A:The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
B:Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
C:Rotary pumps occupy only one-half the space of reciprocating pumps
D:Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pump

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出自：海船船员证

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