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

??

??:???????????,??????????,??????????????