抛物线y2=8x的焦点到准线的距离是______．
由y2=2px=8x，知p=4，而焦点到准线的距离就是p．
故答案为：4．
There at the door stood a girl about the same height__________.
A．as me
B．as mine
C．with mine
D．with me
请你解释说明C组贸易术语的特点。
