A.0.45-0.60B.0.60-0.75C.0.75-0.90D.0.90-1.0
A.-0.8B.-1.1C.-1.3D.-1.5
A.先開二次門,后開一次門,關(guān)時相反B.先開二次門,后開一次門,關(guān)時相同C.先開一次門,后開二次門,關(guān)時相反D.由化驗結(jié)果來決定排污量