分阶段

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,对跳马落地稳定性进行了力学析,对科学体育运动有一定指导作用。

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

实施控制反应条件，用尼镍催化，使大多数组均加氢成对孟烷，无需提纯，即达到工业级的要求。