Study of anti - breakdown mechanism for metal thick tail bolt 金属粗尾锚杆的防破断机理研究
2.
9 self - tapping / self - drilling bolts should not be used unless they are specifically recommended for rock climbing and meet the minimum european standard when installed according to instruction 9施工时，铁板牙锚栓/钻尾锚栓并不适用，除非其上有注明专为攀岩活动设计，并符合欧洲标准的最低标。
