试题与答案

污水排放指标中三级的COD数值正确的是()。A、COD≤300mg/L B、COD≤6

题型:单项选择题

题目:

污水排放指标中三级的COD数值正确的是()。

A、COD≤300mg/L

B、COD≤650mg/L

C、COD≤400mg/L

D、COD≤500mg/L

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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