?????????????????U20?????????????

???????????????????2????????????13??????????????? (????????????????)13??????????,????U20???????????????,?,???

?????????,??????????2??????6??????????,???????????????U20????,?????????,??????????????????????,????4????

?,???,???????????????????,?????,?????????,??????????????????2???7?????,??????????,??????????????????,???????????????S0S???????????????????????????2?????????????????8???,???????,??????

?,??????????????????????2????????????????10?,?????????,?????????????2?12????,???????,?,???????

??????????????,?,??????????????????????????????,????,?????(?????????????????????????) ????:???????????????????????