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NBN A 35-104-1972 3750 《管道和接头 用于水,天然气,污水管道系统的非过滤性钢管两端的尺寸,用于焊接的单插槽端口(周边的)》.pdf
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NBNA3510419723750
管道
接头
用于
天然气
污水
系统
过滤
钢管
两端
尺寸
焊接
插槽
端口
周边
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