钻头末端是空的。
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。
The influence of the initial deflection on the nonlinear lateral free vibration of drill stem is discussed.
讨论了初弯曲对钻柱横向非线性振动的影响。
Therefore the nonlinear lateral free vibration of drill stem is investigated by the perturbation method.
分析公式表明，钻柱横向线性振动仅是钻柱横向非线性振动的一种特殊情况；
Therefore the nonlinear lateral free vibration of drill stem is investigated by the perturbation method.
分析公式表明，钻柱横向线性振动仅是钻柱横向非线性振动的一种特殊情况；
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