(a) They can be done at normal and uniform periods all through college hours, or occasionally established by faculty authorities;T? khóa:Vi?t namTh? thaoHi?n ??iC?ng th?ngCu?c s?ngTh? thao vi?t namTinh th?nCon ng??iCu?c s?ng Hello?n ??iTh? d?c Gi? tr?c ti?p x? s? l??ng truy c?p trên h? th?ng Sites Minh Ng?c r?t l?n nên các b?n c?n l?u ý m?t s