A.75%
B.81.25%
C.85%
D.78%
A.75%
B.81.25%
C.85%
D.78%
A.70%
B.90%
C.50%
D.30%
A.40~55
B.55~70
C.70~90
D.90~99
A.(1-进水浓度/出水浓度)×100%
B.(1-出水浓度/进水浓度)×100%
C.(进水浓度-出水浓度)/进水浓度×100%
D.(进水浓度-出水浓度)/出水浓度×100%
E.(出水浓度-进水浓度)/进水浓度×100%
A.≤10mg/L
B.≤20mg/L
C.≤30mg/L
D.≤40mg/L
A.10~20
B.20~30
C.30~60
D.65~95
A.25%
B.50%
C.75%
D.100%
A.50%
B.60%
C.75%
D.80%
A.增加曝气量
B.增加进水流量
C.控制合适的泥龄
D.提高水温