What is the meaning of :
''Which of the following substances are present in higher percentage in breathed air than in unbreathed air?''
I am not sure what is the question asking...
plz help!! tks very much!!
收錄日期: 2021-04-15 17:06:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20141031000051KK00054