????:1??????????80:??????

2???????

3???????????

4?????????

5???????????

????????12???20????? ?????????????,??????19?????????????,??9????8????????????????????????????

  ??????????19??????????????????,????????9???8??????????? ?????

??????,??????????4???????????????1?,???????????,?????????????????????????19???,?????????????,??????????3?????,???????????????,???,??????????,?????????????

???????????,?????????????,??,?????????,???????????????,???????????,????

?????????,??????????,??????????,??????????,???????????????,?,??????

????????????,??????????????????????????,????????????,???

????:???????