Readings display the powerful voltage based upon the standard worth of samples more than a whole range of periods of the fundamental frequencyCa?ch ?ô?i ve? tru?ng th???ng x? s? mi?n Nam an toa?n nhâ?t chi?nh la? b?n hãy mang t?? ve? sô? ?o? ?ê?n t?i tru? s?? cu?a nha? ?a?i có ghi trên t? vé s? ho??c ca?c v?n pho?ng chi nha?nh, ban ??i di?n