为了实现煤矿安全生产，各矿必须建立稳定的矿井通风系统。
In order to realize safety production in coal mine, ventilation system must be set up.
各矿床具有相似的区域构造地球化学环境、形成规律及成因机制。
They have similar regional tectonic geochemical environment, forming regularity and genetic mechanism.
本文详细介绍了一种准确测算高分散度粉体中各矿物含量的新方法。
This paper presents a new and precise method of determining and calculating mineral content of undue pulverious materials in detail.
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