英语词汇“pilot drifting method, pilot heading method”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	pilot drifting method, pilot heading method
释义	pilot drifting method, pilot heading method 导硐掘进法；巷道或硐室施工时；先以小断面超前掘进；而后再扩大到设计断面的方法。
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