reciprocating pu with unidirectional piston
variable stroke reciprocating pu 变形程往复泵 reciprocating pu with unidirectional piston 单向活塞泵 reciprocating pu with counterrunning piston 对向活塞泵 ..
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reciprocating pu with unidirectional piston
单向活塞往复泵
以上为机器翻译结果，长、整句建议使用 人工翻译 。