“一网” 完善地下排污管网的铺设， 逐步形成“一城一网”。
"One Network": improving the laying of underground sewage disposal pipes so as gradually to achieve "one network for one city".
在上行管的底部设一清洗排污出口，用过一段时间加入清洗剂，打开 下排污口进行冲洗，一根根清洗。
The bottom of the risers is provided with a cleaning drain outlet which can be opened for washing the risers one by one by adding a cleaning agent after a period of use.
承压的地下排水和排污工程用塑料管道系统。基于不饱和聚酯树脂的玻璃纤维增强式热固塑料制品。第3部分：配件。
Plastics piping systems for underground drainage and sewerage under pressure. glass - reinforced thermosetting plastics based on unsaturated polyester resin. part 3: fittings.
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