BS 4660-2000地下重力排水和污水工程用公称尺寸为110和160的热塑性辅助配件(Thermoplastics ancillary fittings of nominal sizes 110 and 160 for below ground gravity drainage and sewerage) BS 4662-1970电气配件外壳用箱规范(Specification for boxes for the enclosure of electrical accessories) ...