更新1:
1. element 2. compound 3. homogeneous 4. heterogeneous which one?
更新2:
wt if......the salt is filtered from beach sand....is the salt still pure substance?
1. element 2. compound 3. homogeneous 4. heterogeneous which one?
wt if......the salt is filtered from beach sand....is the salt still pure substance?
收錄日期: 2021-04-23 22:33:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080216000051KK00684