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關(guān)于軸向往復(fù)運(yùn)動(dòng)的密封問(wèn)題 |
點(diǎn)評(píng)
焊接要非常過(guò)關(guān),泵要常抽,,波紋管不建議用于高直空,,理由是焊的地方多,即使不是焊的也因?yàn)樘∪菀淄笟?nbsp;
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