??2???7?????? ????,??(2?6??????????),??????????????????,??????????????????????6~8????????????????,?????????9~13??;??????????????????????????????????????????????????????????8??????8???????????????,???????????????????????????????6~8?????,??12~16??????,????????

??(7?8????),?,???????6~8?????,????????????10???????;???4~6?,????????8~10?,??????????????????????????????????????10???????

??????,7?????,???????????5~6???????????????7~8?????,????,??????????????????9~10???????????;???????????????????9???????10~11????????8??????,?????,??

?????????

7????,???,?????????????????????????

?,7????8?????????,??????????????,??????????????;???????????????????????????????,?7?,????????

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

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

??

??:???????????,??????????,??????????????