two-piston reciprocating pump
two-piston reciprocating pump 双活塞往复泵 ; 双活塞来去泵 piston of reciprocating pump 往复泵活塞 .
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piston reciprocating pump
piston reciprocating pump 双活塞往复泵 piston reciprocating mud pump 活塞往复式泥浆泵 ..
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短语
双作用活塞式往复泵
double action reciprocating pump
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