Hydogen is even lighter than helium.
Why is hydongen not used to fill airships or party ballons?
PLZ EXPLAIN IT TO ME, THZ:]
收錄日期: 2021-04-13 13:16:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070622000051KK04712