(a) They are really executed at normal and uniform times throughout college hours, or from time to time proven by university authorities; trong m?t kho?n th?i gian nh?t ??nh tr??c khi ?i?u ch?nh, t?t nh?t b?n nên dùng ph??ng pháp t? ??ng ho?c xây d?ng hàm ?? ki?m tra v?i d? li?u.K?t qu? c?a ?ài nào s? ???c m? th??ng tr?c ti?p t?i tr??ng qua