郑和下西洋时的随员
调查资料表明，在黄土高原地区引洪漫灌是一项费用省、经济效益高的水保措施。
It is Shown by investigation data that flooded irrigation in the loess plateau area is a measure of soil conservation with less cost and high economic benefits.
根据洪特第一规则及保里不相容原理，提出了推求原子基态光谱项的一种简便方法。
This paper deals with a method to deduce the atomic ground state spectra terms onthe basis of Hund rules and Pauli exclusion principle.
应用推荐