DOT Hazard Class 危险等级
water r hazard class 对水体危害等级
ordinary-hazard occupancy class 普通火险用房等级
USS Oliver Hazard Perry class 佩里级护卫舰
hazard fist-class personnel-safety 第一级人员安全危害
Oliver Hazard Perry class frigate 派里级巡防舰 ; 美国海军派里级巡防舰
In this paper, hazard theory is combined with coal mine gas accident and coal mine hazard is put forward, analyzing gas accident hazard by the three class of hazard.
本文将危险源理论和煤矿瓦斯事故相结合，提出煤矿危险源这一全新概念，用三类危险源思想来分析瓦斯事故危险源。
Introduction to class, system safety, and hazard identification (PDF).
课程介绍，系统安全，和危险确认(PDF)。
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