商业分析师证书:15.Air behaves like a simple material ___ a mixture of gases.

15.Air behaves like a simple material ___ a mixture of gases. AIR........................ AIR！！！！ like-with-like 是什么意思？ Like by like 是什么意思？？？ AIR 46.28% Air control air condtioned AIR 网址 air hostess