可靠绝缘的要求板与电源部分污染等级为2。
Requirement for reliable isolation degree of pollution 2 for boards and power section.
结果种植基地土壤和灌溉水污染等级均属于“清洁”一级。
ResultsThe quality of soil and irrigation water was good, falling in the categories of "clean".
在中国居住的每个人都知道这里的空气污染等级每天随天气和风向而不同。
As anyone who has lived in a Chinese city knows, air pollution levels vary day to day, with weather and the direction of the wind.
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