英语词汇“pilot hole of shaft, test hole of shaft”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	pilot hole of shaft, test hole of shaft
释义	pilot hole of shaft, test hole of shaft 井筒检查孔；新井开凿前；为核实井筒剖面资料,编制施工设计方案,在井筒附近追加施工的钻孔。
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