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3.wall mining method
壁式采煤法收藏指正
4.caving mining method
崩落采矿法收藏指正
5.underground coal mining method
地下采煤方法收藏指正
6.artificial-support mining method
人工支护采矿法收藏指正
7.self-support mining method
自然支护采矿法收藏指正
8.pillar coal mining method
柱式采煤法收藏指正
9.long wall mining method along dip
倾斜长壁采煤法收藏指正
10.long wall mining method along strike
走向长壁采煤法收藏指正
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