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to phrases
composite seam
expl.
复煤层
全层厚度较大，夹矸层数多，厚度和岩性变化大，夹矸的分层厚度在一定范围内可能大于所规定的煤层最低可采厚度的煤层
textile
结构缝
;
结构缝
各式线缝统称
composite seam:
1 phrase
in 1 subject
Technology
1
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