https://wenwen.sogou.com/z/q780337053.htm
旋转挤压套管锚杆施工技术
https://wenku.baidu.com/view/cf6faa20561252d380eb6ed5.html
http://jz.docin.com/p-1309484748.html
http://www.doc88.com/p-4317421687955.html
http://www.patent-cn.com/E02D/CN1401858.shtml
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