
BS EN ISO 10644. Screw and washer assemblies made of steel with plain washers. Washer hardness classes 200 HV and 300 HV
出版:British Standards Institution

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BS EN ISO 10644. Screw and washer assemblies made of steel with plain washers. Washer hardness classes 200 HV and 300 HV
出版:British Standards Institution
专家解读视频