短语词组短语pump inlet check valve 泵进口止回阀;泵入口单向阀;泵进口止回阀英语oil pump inlet valve 油泵进油阀;翻译;油泵进油阀英语Main pump inlet bottom valve 大泵吸入底阀Sand pump inlet bottom valve 砂泵吸入底阀pump compensator valve inlet 泵补偿器阀入口 返回 pump inlet valve