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

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

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

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