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角接觸球軸承,,面對面安裝和背對背安裝,,哪種剛性好,? |
點評
哎,,談不上“搞”都是在學(xué)習(xí)中,,設(shè)備完好率調(diào)查表,,都是應(yīng)付體系認(rèn)證的,,簡單弄一下
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點評
thanks
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