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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.
文丘里洗涤器中的除尘过程分为（）、凝聚和分离除尘（脱水）三个阶段，前两个阶段在文丘里管内进行，后一阶段在除雾器内进行。
教育法律规范的结构通常包括假定、（）、奖惩三部分。
什么是汽车的行驶平顺性？它主要包括哪些指标？各指标的意义是什么？
尿瘘的治疗描述不正确的（）
下列不是准定语的是（）
以下可以编辑路径的工具有：（）
急性肾小球肾炎多发生于下列哪种细菌所致的上呼吸道感染之后（）
在SE序列T1WI上，下列组织的信号强度由高到低的顺序是（）
关于药物经皮吸收及其影响因素的说法，错误的是（）
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