The coal is a coal resource that reserves in old stratum.

石煤是贮藏在古老地层中的一种煤炭资源.

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Briquette technology is an important way for effectively using coal resource.

型煤技术是煤炭洁净有效利用的重要途径之一.

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Coal resource isn't resource . It's necessary condition for existence of coal mine.

煤炭资源是不可再生的, 是煤矿赖以存在的基础.

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