A:同分异构体数
B:原子个数
C:官能团种类
D:分子中的电子数
—Are you sure this is a photo , the famous comedy actress?
—It surprised you, didn't it? But she was once really thin.
若将下列四支试管放置在28℃的恒温箱中一周,其内微生物繁殖最多的是( )