指出在头部滚筒作为驱动滚筒的布置系统中，胶带最大应变、力及张力位置不在驱动滚筒相遇点，而在过渡段第一组槽形托辊处。
It points out that the position of the maximum strain, stress and tension is at first group trough type roller, not at passing poion of pulley if the head drum works as pulley.
为防止井眼碰撞、窜槽现象的发生，CDXA井组采用了表层预定向钻井技术。
Surface pre-orienting drilling technology is employed for preventing wellbore from collision and channeling in CDXA Cluster Wells.
结果：与对照组相比，模型组牙槽骨骨小梁面积百分数、骨小梁厚度，骨小梁数量、骨小梁分离度差异均没有统计学意义。
Results: Compared with control group, no difference in percent trabecular area, trabecular thick ness, trabecular number and trabecular separation was found in model group.
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