计算:a2·a3= ( )
A:a5
B:a6
C:a8
D:a9
The girl likes eggs, but she doesn't like ________.
下图反映的最主要信息是( )
如右图所示,细绳竖直拉紧,小球和光滑斜面接触,则小球受到的力是( )