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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????????,??????????????,????(???????) ???:?????????????