A.5mm;20mm B.6mm;20mm C.5mm;25mm D.6mm;25mm
A.15mm B.16mm C.17mm D.18mm
A.分多次安裝,每次支設(shè)高度不宜超過1.5m B.隨混凝土澆筑隨安裝 C.隨水池的實(shí)際情況而定,分期分批安裝 D.一次安裝到頂