Your browser isn’t supported any more. Update it to obtain the very best YouTube practical experience and our most recent features. Learn more 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.H?i ??ng x? s? ki?n thi?t mi?n B?c bao g?m 28 ??n v? thà