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???2???????8??????(??????????????????? ???????????)?????,?????????????????????8??
??8??8????????????50???:??,???8???9?????,???????????5????10???,???????
????5???????????8?9??????,??????????????
????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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????????? ??????????10?????????????????????