There are many animals in the zoo,and some of them are scary.
A:kinds of;kind of
B:kinds of;kinds of
C:kind of;kinds of
D:kind of;kind of
在化学反应A+B=C+D中,已知5gA与10gB恰好反应生成了13gC和若干克D,要制得4gD,参加反应的A的质量为____。
亚洲与非洲的分界线是( )