A.80mm~100mm; B.50mm~80mm; C.10mm~40mm; D.3mm~10mm
A.泵房集水井的進口處 B.塵沙池出口處 C.曝氣池的進口處 D.泵房的出口處
A.沉淀 B.中和 C.氧化還原 D.電解