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shaft pillar extraction
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
记忆提示
🎯 重点记忆:
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 00:13:20