坑道内大口径、长延伸、低电阻率的金属管道，对测深资料的影响非常大。
The heavy caliber, long extension and lower resistivity impact on sounding data extremely.
如果延伸传回本身，相关资讯就会包含在资料中。
When the extension returns itself, the relevant information is contained in the data.
如果延伸传回本身，相关资讯就会包含在资料中。
When the extension returns itself, the relevant information is contained in the data.
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