《90 阀芯英语怎么说.doc》查看内容详情
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"90 valve stem" 是指 90 度的阀芯。阀芯是指在阀门中控制气体或液体流动的一个部件。它通常是在阀门的手轮或电动机上操作的，可以控制气体或液体的流动。来源：阀芯的概念可以追溯到古希腊时期，当时人们使用木制的阀门来控制水流。在古
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