有关化学用语正确的是( )
A:乙烯的实验式C2H4
B:乙醇的分子式C2H5OH
C:乙酸乙酯的结构简式 CH3CH2OOCCH3
D:羟基
It was my birthday yesterday. My friends bought some ____ for me.
海洋形成的原因是( )