1984资源列表
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[国外标准] DIN 2089-1-1984 Helical compression springs made from round wire or rod Calculation and Design
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[国外标准] AWS A5.7-1984 Specification for Copper and Copper Alloy Bare Welding Rods and Electrodes R(1991)
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[国外标准] AWS A5.6-1984 Specification for Covered Copper and Copper Alloy Arc Welding Electrodes R(1991)