The controlled roles of coal－ accumulation by paleostructure and paleogeography and sedimentary environment have been explained, through analysis and study of Late Paleozoic coal－ bearing strata in Ningxia Region.
通过对宁夏晚古生代含煤岩系的分析研究，阐述了古构造、古地理、沉积环境对煤层聚积的控制作用。
Computer automatic measuring system of gas volume fraction;
气体的体积分数计算机自动测试系统