“pilot hole”的概念、定义、翻译、参考文献-科学参考

单词	pilot hole
释义	pilot hole Encyclopedia 理学地质钻孔释 pilot hole先导孔在钻深孔或超深孔之前，在深孔或超深孔孔位附近钻的一口直径相对较小、深度相对较浅的钻孔。“双孔方案”中首先施工的钻孔。
随便看	operator space operator spectrum operator splitting operator splitting method operator-stable operator structure operator theorem operator-theoretic method operator theory operator topology operator transform operator-valued coefficient operator-valued distribution operator-valued function operator variable operator with a trace operator with continuous spectrum operator with dense domain operator with the boundary condition Opera Troupe Opera Troupe Found by Jiang Chun of Qing Dynasty opera troupe found by Pan Yunduan of Ming Dynasty opera troupe found by Qian Dai of Ming Dynasty opera troupe found by Ruan Dacheng of Ming Dynasty opera troupe found by Sheng Chunkui of Qing Dynasty

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