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| 导硐隧道施工中为增加开挖的临空面,或探查掌子面前方地质条件，并为整个隧道导向而开挖的坑道,参见 guide adit; 掘进工作面掘进巷道的尽头工作面，又称超前工作面，参见 excavating face | |||
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