机体对药物的过敏反应可发生于（）
A.多次用药后
B.首次用药后
C.两者均是
D.两者均不是
参考答案：A
—Jim, I'm afraid I can't go to your party tonight. My grandma is ill.
—______. [ ]
A. I'm sorry to hear that
B. That's all right
C. She has to stay in bad
D. Don't worry
蝶骨电极进针部位错误的是（）。
A.颧弓中点下缘乙状切迹处
B.耳屏前方2.5cm
C.进针深度约4～5cm
D.卵圆孔周围
E.可用针电极
