A:HCl
B:Cl2
C:CO
D:NH3
- How is Susan?
- Oh, I see her because she lives abroad.
Sometimes children are ____ young ____ they can't tell the bad from the good.
如图是太阳系局部图,黑点表示小行星.回答下列下题.
观察图,分析四个现象中的物态变化属于液化的是( )