Through researching on coal - bearing stratum in Shuanghua coal field, the usual coal formation rules are reviewed.

通过对双桦煤田含煤地层的研究,总结出了双桦煤田的一般成煤规律.

互联网

Through analysis on coal formation and system, expound the change regulation of Boli coal field.

通过对含煤建造及构造体系的分析,探讨了勃利煤田的变质规律.

互联网