and资源列表
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[国外标准] ASTM F2506-07 Design and testing of fixed-pitch or ground adjustable light sport aircraft propellers
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[国外标准] JIS P8150-2004 Paper and board -- Determination of colour(C-2 degree) -- Diffuse reflectance method
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[国外标准] JIS P8149-2000 Paper and board -- Determination of opacity (paper backing) -- Diffuse reflectance me