Kaolin is a very important use of a very wide range of non-metallic minerals.
高岭土是一种非常重要、用途十分广泛的非金属矿物。
The sealing ring by a similar to the rubber or plastic non-metallic materials.
该密封圈由一种类似于橡胶或塑料的非金属材料制成。
The sealing ring by a similar to the rubber or plastic non-metallic materials.
该密封圈由一种类似于橡胶或塑料的非金属材料制成。
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