Taking level curvet as an example,the landing stability of horse-vaulting is analyzed mechanically by stages,which is useful for scientific sports.

以水平腾跃为例,跳马落地稳定性分阶段进行了力学分析,科学体育运动有一定用。

By controlling reaction condition in different steps and hydrogenated with Raney Ni,most of components were converted into industrial grade p-menthane without purification.

实施分阶段控制反应条件，用尼镍催化，使大多数组分均加氢烷，无需提纯，即达到工业级的要求。