You are able to compare a waveform of 1 period by using a waveform of A different phase or Look at having a Formerly calculated waveform on exactly the same exam level. Page 69: Interaction??c Tr?n Quy?t Chi?n và Bao Ph??ng Vinh giúp Vi?t Nam th?ng c?u vô ??ch B?, ?? l?n ??u vào bán k?t gi?i carom 3 b?ng ??ng ??i th? gi?i.B?n c?ng có th? xem