A.預(yù)埋金屬螺旋管留孔 B.預(yù)埋塑料波紋管留孔 C.預(yù)埋泡沫塑料棒留孔 D.抽拔鋼管留孔 E.膠管充氣抽芯留孔
A.600mm B.900mm C.1000mm D.1500mm
A.10mm B.8mm C.15mm D.12mm