发布时间:2025-01-31 08:54:28
滑动导柱导套:20号钢。
渗碳深度0.8---1.2. HRC58-62淬火
滚动导柱导套:
GCr15钢 HRC62-66淬火
在新疆河里捡到一块原石有油性密度大重量也很重去杭州检测后说这是钠长石玉可能吗我认为是墨玉
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