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煤层顶板
tech.
coal seam roof
;
roof
煤层顶板
在正常顺序的含煤岩系剖面中,直接覆于煤层上面的岩层
expl.
roof of coal seam
煤 层顶板
:
8 phrases
in 2 subjects
General
3
Technology
5
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