1139是什么意思?RT
RT
标准号：BS 1139-2.1-1991 外文名称：Metal scaffolding - Couplers - Specification for steel couplers, loose spigots and base-plates for use in working scaffolds and falsework made of steel tubes 中文名称（翻译）：金属脚手架.第2部分:联接件.第1节:钢管制操作用脚手架和膺架用的钢联接件松插口和底板