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精密仪器用宝石.第2部分:钟表宝石、天平宝石
Jewels for fine mechanics; watch jewels, balance jewels
参考页数:2P.;A4
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钻石色级目视评价方法
Color grading of polished diamond by visual matching
价格:¥0.00
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散装滑石取样、制样方法
Method of sampling and sample preparation of talc in bulk
价格:¥0.00
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毛坯钻石检验和分级
Rough diamond inspection and grading
价格:¥0.00
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