T? k?t Champions League ???c k? v?ng h?p d?n, v?i nhi?u tr?n ??i chi?n có th? x?y ra, trong ?ó có c?p ??u ti?m n?ng nh? True Madrid g?p Barca. Other variables, like line outages and sags or maybe the starting and stopping of the motor, also can induce intermittent activities