B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: C\u00f4ng su\u1ea5t \u0111i\u1ec7n ti\u00eau th\u1ee5 c\u1ee7a m\u1ea1ch \u0111i\u1ec7n xoay chi\u1ec1u – H\u1ec7 s\u1ed1 c\u00f4ng su\u1ea5t (ph\u1ea7n 2)<\/a><\/blockquote><\/iframe>