呈上下方向，并与水平相垂直的轴，称为（）
A.矢状轴
B.冠状轴
C.垂直轴
D.额状轴
参考答案：C
下面度数的角不能用三角板画出的是[ ]
A ． 15 °
B ． 45 °
C ． 80 °
D ． 135°
You afraid of doing homework. You know, it’s easy. Just be careful.
A．don’t have to
B．have to be
C．don’t have
D．don’t have to be
