在砂卵石地层中勘察钻探时,要解决三个关键性的问题:一是钻进进尺问题;
There have three decisive questions need to solve while drilling in sand gravel layer. The first question is drilling footage.
在砂卵石地层中勘察钻探时,要解决三个关键性的问题:一是钻进进尺问题;
There have three decisive questions need to solve while drilling in sand gravel layer. The first question is drilling footage.
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