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holing-through是什么意思

holing-through

英['həʊlɪŋθr'u:] 美['hoʊlɪŋθr'u]

贯通[掘进]，小巷；

相关单词 holing through

行业词典

煤炭：贯通［掘进］；"又称 :贯通［掘进］(thirling ,heading through) "；井巷掘进中，采用一个或两个工作面按预定方向与预定井巷或硐室接通的作业。；

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