?????????????????????
???β????????????????????????ο?????·??·?????ο???????????????????????300m??800m?????????У???????????????????????????300~500m??????????С??羰????·???????????500~800m????
???????????????????????????????????????????200m??500m?????????????????500m??
????????????????????????????300??500m????????????????????С??300m???????????????????750??1000m???????????????????????Χ??δ?????????????100??150m????????????300??500m??
???β?????????????????羰??????????????????????????????????????????????????????????????????????200m??500m????????????????500m???????????????, ????????