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