[❓️질문] 질문있어염><

[설의목표서울대..(147.47)]

아뉘 답이 4번이라는데 ㄷ이 왜 맞는거임???? 

[능지상승(jini0524)]

왜나도2나오지 - dc App

[Laqranqian(ghk2rkwk)]

https://m.dcinside.com/board/physics2/633292
- dc App