Then, based on retrospective law introduced systematic study of the wisdom of the content and features of beer, a retrospective study of the role of law in the system;
然后，介绍了基于回溯法的智能排课系统研究的内涵及特征，研究了回溯法在系统中的作用；
Methods: By epidemic retrospective study, we have investigated the occurrence and distributive law of occupational injury from 1980 to 1999 in a non-ferrous metal company.
方法：用回顾性流行病学调查方法，调查某有色金属企业1980—1999年职业伤害发生情况和分布规律。
Methods: By epidemic retrospective study, we have investigated the occurrence and distributive law of occupational injury from 1980 to 1999 in a non-ferrous metal company.
方法：用回顾性流行病学调查方法，调查某有色金属企业1980—1999年职业伤害发生情况和分布规律。
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