?? PFOS???:??????????
????:1???????????:???50???????
2?????v
3?????
4????????
5???????
???????,??,?????????????????????????????
???????????:???????????,??,?????????????????????????????
???????????:????????:1???????????:???50???????
2?????v
3?????
4????????
5???????
???????,??,?????????????????????????????
???????????:????