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我国首个！涉及“工业大米”的国际标准发布以螺母螺帽为代表的紧固件 ... 内外螺纹的极限尺寸（M1.6至M100螺纹公差带为6H和6g，M1至M1.4螺纹公差带为5H和6h）》近日正式发布。 本次修订是该 ...
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