shaft pillar extraction

英 [shaft pillar extraction]
美 [shaft pillar extraction]

中文释义

井筒煤柱开采

单词分析

单词结构：

shaft pillar extraction

字母数：23

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  • 单词拼写：shaft pillar extraction
  • 核心含义：井筒煤柱开采

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更新时间：2026-02-02 04:56:23