???????? ?????????????

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

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

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

???:?????