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1. |
In which type of trickling filter is nitrogen oxidized? |
A. | tLow or standard filtration rate(Rock type) |
B. | tIntermediate filtration rate (Rock type) |
C. | tHigh filtration rate (Rock type) |
D. | tRoughing (Plastic/Rock type) |
Answer» B. tIntermediate filtration rate (Rock type) | |