One effective way is preferred pump barrel and plunger of materials and surface treatment processes.

其中一个有效的方法就是优选泵筒和柱塞的材料和表面处理工艺。

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One effective way is preferred pump barrel and plunger of materials and surface treatment processes.

其中一个有效的方法就是优选泵筒和柱塞的材料和表面处理工艺。

youdao