长方形有请选择CBA/U;i2D5G*b/C条对称轴。3n2L/W,_8H4l.e,x
A.13n2L/W,_8H4l.e,x
B.23n2L/W,_8H4l.e,x
C.43n2L/W,_8H4l.e,x