化學問題!!!!!!!!!!!!!!!!!
回答 (1)
2007-09-30 12:03 am
✔ 最佳答案
天然產品:: oxygen, hydrogen, carbon, calcium, pottasium
because they are all elements
人工合成產品::
plastics, paper, glass, alloy, metal block
because they are all compound/mixture.
參考: myself
收錄日期: 2021-04-23 12:57:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070929000051KK02219