The lousy effectiveness AT&T's stock has endured in the last number of several years is a reflection of three factors:K?t Qu? X? S? K?t Qu? X? S? Mi?n Nam K?t Qu? X? S? Mi?n Trung K?t Qu? X? S? Mi?n B?c KQXS Các T?nh KQXS ?i?n Toán X? s? ?i?n toán Mega 6/forty five X? s? ?i?n toán Electricity 6/55 X? s? ?i?n toán Max3D Pro X? s? ?i?n toán Max