问题
单项选择题
曝气池出口处的溶解氧浓度宜为()mg/L,除非工艺有特殊要求。
A.1
B.2
C.3
D.4
答案
参考答案:B
曝气池出口处的溶解氧浓度宜为()mg/L,除非工艺有特殊要求。
A.1
B.2
C.3
D.4
参考答案:B
句子改错。 | |||||
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