Basic principle: Readings display the helpful voltage based upon the typical worth of samples around a complete number of periods of the elemental frequency Ch? nh?t: Kiên Giang, Lâm ??ng, Ti?n Giang K?t qu? XSMN ???c s?p x?p m?c ??nh theo l?ch m? th??ng Union SG ?ang ??ng ??u t?i