roof control by wall-shape pillar

[roof control by wall-shape pillar]
[roof control by wall-shape pillar]

中文释义

煤柱支撑顶板法

单词分析

单词结构:

roof control by wall-shape pillar

字母数:33

记忆提示

🎯 重点记忆:

  • 单词拼写:roof control by wall-shape pillar
  • 核心含义:煤柱支撑顶板法