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大幅度提高硬質(zhì)合金鉆頭和鎢鋼銑刀耐用度的秘密

許多客戶經(jīng)常講進(jìn)口硬質(zhì)合金鉆頭和鎢鋼銑刀比較耐用，國產(chǎn)的鉆頭和銑刀耐用度太差，以前國人百思不得其解， ...

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