Commonly used in machinery industry only oilstone natural abrasives.

机械工业中常用的天然磨具只有油石。

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Emery, Natural Corundum, Natural Garnet, Natural Abrasives, Aluminum Oxide, Waste Of Plastics, Parings Of Plastics, Iron.

新加坡公司求购刚玉砂，天然金刚砂，天然石榴石，天然磨料，氧化铝，塑料废料，塑料切片。

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Abrasives source of their raw materials, there are two kinds of natural abrasive and artificial abrasives.

磨具按其原料来源分，有天然磨具和人造磨具两类。

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