“parallel heading”的概念、定义、翻译、参考文献-科学参考

单词	parallel heading
释义	parallel heading Encyclopedia 工学辅助坑道设计释 parallel heading平行导坑修建在隧道一侧与隧道走向平行、掘进面超前于隧道开挖作业面的施工导坑。
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