???? 15? ??3? ?? ?? ?? ?? ????? ?????? ??? 0.125ppm?? ??? ?????? ????? ???. ?????? 0.12ppm? ??? ???? ????.
???? ?? ?? ????? ?? ????? ??? ????? ??? ??? ????? ???? ??? ?? ?? ???? ?? ????. ?? ?? ?? ?? ???? ???? ???? ?????? ????.
jyw11@donga.com
-
- ???
- 0?
-
- ???
- 0?
-
- ???
- 0?
![5?? ?? ‘??’ ???[????/???]](https://dimg.donga.com/a/464/260/95/1/wps/NEWS/FEED/Donga_Home_News/130936456.1.thumb.jpg)
