... 方钙饰镧矿 beckelite 煤层变薄 bed thinning 层状铁矿 bedded iron ore ...
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coal bed thinning belt 煤层变薄带
bed d thinning 煤层变薄
·2,447,543篇论文数据，部分数据来源于NoteExpress
Coalfield structure was controlled by NNE structure. Coal bed structure thinning belt was also extended in NNE directions, Southern Hebei coalfield.
煤田构造主要受北北东向构造所控制，其煤层构造变薄带也主要呈北北东向伸展。
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