2?8???,??100??,?????????????
????????????:??
??????????????????
??????????????????????
???????????????????????
??:??????????
??????????????360°????
??:????1??????????????
??:????????????
?????????????????????
????3???????
?????????,??????????40??
??????????????360°????
???????????????????
??:?????????????????
???????????????????
???????????10????????
????????????:???????
???????(?)“??”“??”“??”????…
?????:??&????????????
???COS??????????:?????
????????:????????????
??????10???6????4??????
?????????????????????
??:?????????????????
?????????????????????
??????:??2??6??????????