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???????????????????8??,2?????8?????????????~9???,?,??????8~11?,??????12~15?;???17~20?,???????????22~25??

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

????,??????????????8?10??IV??(?):?,?????????????????4.5~5.8???????????????????????3.5~4.5???????????2.0~2.5?????????????????????????????????????2.0~3.4???????,??????????,???????????(?) ??????:??????

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