The posterior convex Angle of thoracic vertebrae was increasing with the age and physiological change.
胸椎后凸角值随年龄的增大而增大，符合生理性改变。
On the base, it also put forward the suggestion to correct the convex Angle size of preshaving hob cutter.
在此基础上，提出了剃前滚刀凸角尺寸修改的建议。
The result indicates that the corner turning distance and the volume of the dead region change with the angle of the convex corner.
结果表明，拐角距离和死区面积随拐角角度的变化而变化。
Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.
该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；
Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.
该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；
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