试题与答案

下列选项中,大气污染现状监测周期和频次要求说法正确的是( )。A.一级评价项目不得

题型:多项选择题

题目:

下列选项中,大气污染现状监测周期和频次要求说法正确的是( )。

A.一级评价项目不得少于两期(夏季、冬季)

B.二级评价项目可取一期不利季节,必要时也应作两期

C.三级评价项目必要时可作一期监测

D.每期监测时间,一级评价项目至少应取得有季节代表性的七天有效数据

答案:

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