A. 布水器堵塞 B. 塔温下降 C. 生物膜干裂脱落 D. 滤池缺氧
A. 0.3 B. 0.5 C. 0.8 D. 1.0
A. spring,around late evening B. spring,around early evening C. fall,around early morning D. fall,around midday