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通过对一、二层煤的对比分析 ,证实二层煤为一层煤的分支煤层 ;确定了一、二层煤间的主要标志层。
By comparing and analyzing the first and second layers of coal, the second layer of coal is confirmed as the branch coal layer of a layer of coal; the main index layer of the first and second layer of coal is determined.