Air contains nitrogen, oxygen, carbon dioxide, noble, a group of gases called __(A)__, etc. Among the gases named, __(B)__ makes up the highest precentage of air while__(C)__ makes up the smallest. The precentage of oxygen in air is about __(D)__.
PLEASE FILL IN THE EMPTY LINE .
About gases
2007-10-06 6:42 pm
回答 (2)
2007-10-10 2:44 am
✔ 最佳答案
(A) inert gas, noble gas (e.g. argon)(B) nitrogen
(C) carbon dioxide
(D) 21%
2007-10-11 1:53 pm
(A) side gas
(B) side gas
(C) noble gas
(D) sometimes 0% sometimes 101%
(B) side gas
(C) noble gas
(D) sometimes 0% sometimes 101%
收錄日期: 2021-04-13 13:47:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071006000051KK01098