H?i ??ng x? s? ki?n thi?t mi?n B?c bao g?m 28 ??n v? thành viên, trong ?ó có 6 ??n v? t? ch?c quay s? chính th?c và c? ??nh hàng tu?n c? th? nh? sau:Industrial tools demands a dependable electric power provide to work adequately, use the twin enter to obtain critical energy measurementsOscilloscope customers know how complicated triggering c