Nine9 耐久公司 0.5D钻尖導引孔理論
用90度中心钻打中心孔兼倒角,雖然省工時,
但是鑽頭外角容易損壞,鑽頭壽命減短.
Nine9 耐久公司 0.5D钻尖導引孔理論
用90度中心钻打中心孔兼倒角,雖然省工時,
但是鑽頭外角容易損壞,鑽頭壽命減短.
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