Thes detecting structure instrument of the roof rock is integrated in the pneumatic bolt drill and data processing is adopted BP algorithm of mature net to identify the structure.
其中，顶板岩层结构探测仪是集成在风动锚杆钻机上，数据处理采用训练成熟的BP算法神经网络进行结构的识别；
The anchorage force of consolidated anchorage with prestressed bolt is actually the friction resistance between sand and the wall of drill hole.
砂固结预应力锚杆的锚固力是由砂体与锚孔壁之间的摩擦力提供的。
Drill two tunnels at the PCL attachment point inside the thighbone, intersecting with the reconstructed 1igament from the two tunnels behind the shank, fixing the free end using the absorb bolt.
于股骨内髁PCL附着点处分别钻取前后两隧道，与胫后内外两隧道引出的重建韧带形成交叉，游离端使用可吸收螺钉固定。
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