该飞船有二级超光速推进器。
除超晶格的主衍射峰外，还观察到一级和二级卫星峰。
The first and second order satellite peaks around the main reflection appear in the superlattice rocking curve.
本文研究了镍超细粒子催化剂对二级醇液相脱氢反应的催化性能。
In this paper. the dehydrogenation activities of Secondary Alcohol over Ni-ultrafine particle catalyst has been studied.
应用推荐