BS 4872-1-1982 焊接工艺不需认可时焊工的鉴定考试规范.第1部分钢的熔焊 Specification for approval testing of welders when welding procedure approval is not required - Fusion welding of steel
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BS 4872-1-1982 焊接工艺不需认可时焊工的鉴定考试规范.第1部分钢的熔焊 Specification for approval testing of welders when welding procedure approval is not required - Fusion welding of steel
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链接：https://pan.baidu.com/s/1FLvbO42thNU-_Nm7goyKzg
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