文章运用安全系统工程的有关理论和方法，在安全分级评价的基础上进行安全控制的方法、原则以及具体措施的探讨。
This article utilizes the systematical safety engineering project in principle, study on the method and principle of the safe control and the concrete measures on the basis of safe ratings evaluation.
本文应对这种煤矿安全管理与工伤保险风险评估的需要，对全国29个大型煤矿进行工伤保险的安全分级评价调查研究。
The dissertation focused on the Coal Gas and Grime Explosion accident, applying the model to evaluate the grade of 29 mines.
参照国家食品卫生标准和蔬菜质量分级标准，对蔬菜的重金属污染程度进行了安全性评价。
The safety of vegetable pollution by heavy metals was evaluated referring to national food hygienic and vegetable quality gradation standards.
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