???????????2?????15???????????? ?????????2?????????????14???????,??????????????????
???????????,??50????????,????????????,????????,???????,????,??????????????????????????????????????,?????????????????????????????????????????????????????????,??????????,???50????????
????????????,?????????????,??????????????????,??????,?????????????,????????????,????????????,?????????
????????????,????????????????,??,????????50?????????????,????????,?,??
??????????????????,????????????????,??????????(????????????????) ???:??????????????
??????6.6???????10??
?????????????:????????
?????????10?????10????
“???”?“???”,?????????????
??????6.6???????10??
??????????????????????
??????:??????????
????????????????????
??????????????360°????
????????????????????
??????!??:???????????
????????????????????
“???”?“???”,?????????????
??????????????3??????
??????10???6????4??????
??:???????????????????
??????6.6???????10??
??:????????????11?45?
?????????????????
??:???????????????????
????????????????????
??????!??:???????????
??????0.7%???0.8%
??????????????2000?????
????????????:?????????