外源污染物 xenobiotic pollutants
外源污染物 xenobiotic pollutants
相关考题：
根据《环境影响评价技术导则大气环境》，大气污染源排放的污染物按生成机理分为（）。A. 点源、线源、面源和体源B. 颗粒态污染物和气态污染物C. 一次污染物和二次污染物D. 基本污染物和其他污染物
在环境化学污染物中，一次污染物是指（）。A、从污染源排入环境后，理化特性发生了变化的污染物B、从污染源直接排入环境，理化性质未发生变化的污染物C、从污染源排入环境后，其毒性增大的污染物D、多个污染源同时排出的同一类污染物E、多种环境介质中都存在的同一类污染物
问答题The worst pollution threat is concentrated in and near large cities. There the people-made pollutants increasingly surpass the ability of air and water to dilute (冲淡；稀释) the contaminants (污染物) to safe levels. The natural ecological cycle depends on plants, which absorb some pollutants and release oxygen to the air. But near large cities, natural vegetation becomes scarce, and introduced trees, ornamental shrubs and gardens are far from adequate in absorbing motor vehicle and industrial air pollutants. Finally, some pollutants, most notably atomic waste, may continue to contaminate air, land, and water for thousands of years. Therefore, ecocrisis—ecocatastrophe or ecocide—has been for some time one of the major concerns of not only the ecoactivists and environmentalists, but of many scientists of other fields and the government authorities of many countries as well.
名词解释题非生物物质 xenobiotic substances