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M
<p>原来硬质合金和铁屑价格差这么多，以前都混着卖了</p>
U
<p>刚入门的话建议先买国产的，用熟了再升级</p>
<p>热变形那段说到点子上了，以前我们经常忘记等冷却</p>
S
<p>这个价格表很实用，正准备买抛光机</p>
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