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介绍了全面迭缩式不提钻换钻头钻具的结构、工作原理和使用特点，分析了此种钻具应用于中国大陆科学钻探中的前景及需要解决的问题。
This paper introduces the structure, working principle and application characteristics of a fully telescopic jackless drill bit. The prospect of such a drilling tool used in scientific drilling in mainland China and the problems to be solved are analyzed.