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中華人民共和國國家標準

　　UDC (621.314.21

　　變壓器和電抗器的聲級測定            +621.318.43

　                             �。�534.6

　　Determination of transformer and reactor sound levels  GB 7328-87

　　國家標準局1987-03-02批準                                 1987-10-01實施

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