屈曲

Kicking a ball is a complex coordinated action involving simultaneous knee extension and hip flexion, so developing a more powerful kick requires exercises applicable to these muscle groups.

踢一个球是一个复杂的协调行动，同时涉及伸膝，髋关节屈曲，从而形成一个更强大，需要踢练习适用于这些肌肉群。

It points out the necessity of tubing anchor in pumping well s,especially in deep wells.

定量分析了抽油机井油管自由悬挂可能造成的危害：降低泵效；油管柱振动加速了油管的疲劳破坏；油管屈曲造成套管、油管、抽油杆柱之间的多重磨损。

With the universal application of computer and development of numerical implementation, building member models fitting reality by computer can calculate buckling bearing capacity of axle loading members under effect of residual stresses.

随着计算机普及应用和数值分析方法的不断发展，可以通过计算机建立与实际吻合的构件模型，较准确、快捷地计算出残余应力影响下的轴压构件屈曲承载力。

Therefore,considering the restriction of the wellbore and packers,the differential method and energy method was used to analyze the bend of pipe between the two packers.

分析表明，在井眼和封隔器的约束下，跨隔段管柱有三种屈曲构型：一个半波弯曲、两个半波弯曲和螺旋弯曲。

The practice of deep well diameter extension and washing, blasting is introduced in this paper.

介绍深水井中的扩径与洗井爆破工艺，并就如何保证爆效、加工和密封装药容器及容器在高水压下是否发生屈曲失稳的验算等进行了叙述。

Hoist boom section ; Finite element ; Anti-buckling-instability

起重臂截面；有限元；抗屈曲失稳

Stress wave effect is one important parameter considered in the study and it may have some influence on the dynamic buckling of axial compression member.

其中，应力波效应也作为一个重要参数纳入到研究范围中，对轴心受压构件的动力屈曲有重要影响。

Final, some problems about axial compression member under impact load are studied, which focus on the form of impact load, damage of material, local dynamic buckling of plate. Some calculation method and research viewpoints are presented.

最后，就冲击荷载作用下轴心受压构件的若干问题进行了研究，重点集中在冲击荷载形式、材料损伤、板件局部动力屈曲三个方面，给出了一些相关计算方法和研究思路。

Fourth, systematic study on dynamic buckling of axial compression initial bending member through finite difference method, considered residual stress simultaneously, make some valuable conclusions.

然后，通过有限差分法对初始几何缺陷轴心受压构件的动力屈曲进行计算，并同时考虑残余应力作用，得到了一些有价值的结论。

First, systematic study on propagation, reflection and interaction of axial stress wave is made to deduce the calculation equation for axial elastic and plastic stress wave, which fit for analysis of impact buckling of axial compression member.

本文首先对轴向应力波在构件中的传播、反射及相互作用进行系统分析，推导出适合轴心受压构件冲击屈曲分析的轴向弹、塑性应力波计算公式。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。