... annular casing 环形壳体,环形外壳 bore-hole casing 钻孔套管 boring casing [钻探]套管 ...
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A reasonable mechanical design of the main die body was given on the basis of considering every determining factors such as the bore hole condition (casing or not).
并根据井眼条件(有无套管)等方面因素，对打捞主体的机械结构进行了合理设计。
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