The paper describes results of research on stresses in roadway sides and limit equilibrium zone conducted by researchers both at home and abroad, and points out the existing problems.
本文介绍了国内外学者对煤层巷道两帮煤体应力及极限平衡区的研究成果，指出了研究中存在的问题。
To date theoretical research on gas-liquid-solid three-phase equilibrium in reservoir fluid is a popular subject of petroleum industrial world at home and abroad.
目前，对地层流体气—液两相、气—液—固三相相平衡理论研究是国内外石油工业界中的一个热点课题。
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