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BS 4872-1-1982 焊接工藝不需認可時焊工的鑒定考試規范.第1部分鋼的熔焊 Specification for approval testing of welders when welding procedure approval is not required - Fusion welding of steel.PDF

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BS 4872-1-1982 焊接工藝不需認可時焊工的鑒定考試規范.第1部分鋼的熔焊 Specification for approval testing of welders when welding procedure approval is not required - Fusion welding of steel

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