低级烟煤 meaning in English
low rank bitumite
low-rank bituminous coal
Examples
- Synthetically analyzed the fracture , earthquake , coal ranks and their distribution , coal seam ' s buried depth and so on , the authors have realised that low - rank bituminites , early - middle jurassic in tianshan area , are formed by burial metamorphism , and it is widespread
摘要通过对天山地区的断裂构造、地震、地热、煤级及其时空分布、煤层埋深等因素的综合分析，认为天山北缘及其邻区早中侏罗世大范围分布的低级烟煤主要由深成变质作用形成，深成变质作用具普遍性。