hazard substance

基本解释

Chemical hazard: refers to the content of a chemical substance in more than the normal level and on human health hazards.
化学性危险：指食品中化学物质的含量超过正常水平并对人类健康有危害。
Results The proportion in senior students was higher than in junior students for the students who knew that there was hazard substance in cigarette.
结果高二组学生对于烟草中含有的有害物质知晓率高于初二组；
The nation has established the identification standard of major hazards, and the identification basis is the quantity of hazard substance. The standard is mainly used in the chemical plant.
国家已经制定了重大危险源辨识标准，辨识依据是危险物质的数量，主要适用于化工行业。