美国宝石研究院 GIA
金刚石研磨膏 diamond paste ; diamond lapping paste ; diamond compounds
光石研 Ken Mitsuishi
金刚石研磨机 diamond lapping machine
岩石研磨性 rock abrasivenesss ; rock abrasive properties
石研磨机 stone grinder
金刚石研磨 diamond lap ; Diamond Grinding
矿石研磨机 ore grinder
宝石研究实验室 gem study laboratory
杯型钻石研磨机 cup shaped diamond grinding wheel
实验结果表明：煤研石的综合利用必须依据它的自身的化学组成、结构与工艺性质来确定利用的方向。
Experiment results show: we should make full use of the coal shale according to its own structural and technology nature and the chemical composition.
作为己有百余年生产历史的老矿区，煤研石的无序堆放势必成为一种主要的地质灾害。
As an old mining district with one hundred years ago history, the disorder stack of waste rock undoubtedly becomes one kind of geological hazard.
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