全麻强度的测定指标中，应用最少的是（）
A.夹尾
B.切皮
C.翻正反射
D.电刺激皮肤
E.意识
参考答案：E
I told them not everybody could run as fast as you did, ________?[ ]
A. could he
B. didn't I
C. didn't you
D. could they
设斜率为2的直线l过抛物线y2=ax（a≠0）的焦点F，且和y轴交于点A，若△OAF（O为坐标原点）的面积为4，则抛物线方程为[ ]
A．y2=±4x
B．y2=4x
C．y2=±8x
D．y2=8x
