问题
单项选择题
采用自动监测空气质量的城市,全年优良(API≤100)的天数应()。
A.≥全年天数的70%
B.≥全年天数的75%
C.≥全年天数的80%
答案
参考答案:A
采用自动监测空气质量的城市,全年优良(API≤100)的天数应()。
A.≥全年天数的70%
B.≥全年天数的75%
C.≥全年天数的80%
参考答案:A
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