问题:
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 pum
● 参考解析
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