coal pillar and roof system的意思|示意
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英 / /
煤柱和顶板系统
coal pillar and roof system的网络常见释义
煤柱 煤柱-顶板系统
coal pillar and roof system相关例句
The roof of cavern is regarded as an elastic beam with support at the midpoint and the coal pillars are regarded as bearings so as to establishing a cavern roof-coal pillar system.
将顶板视为中点有支承的弹性固结梁，将煤柱视为支座，形成了顶板-煤柱系统。