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classification of coal mining roof
classification of coal mining roof
英
[classification of coal mining roof]
美
[classification of coal mining roof]
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煤矿顶板分级
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单词结构:
classification of coal mining roof
字母数:34
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单词拼写:classification of coal mining roof
核心含义:煤矿顶板分级
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更新时间:2026-02-04 16:44:36