单选题:对非稳定排放源采用加密监测方法,一般以每日开工时间或24h为周期,每个周期依据实际排放情况按每(  )h采样和测试一次。

题目内容:
对非稳定排放源采用加密监测方法,一般以每日开工时间或24h为周期,每个周期依据实际排放情况按每(  )h采样和测试一次。 A.1~2
B.2~4
C.2~3
D.3~4
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