缺血性心脏病最常见的病因是（）
A.主动脉瓣狭窄
B.心肌肥厚
C.严重贫血
D.冠状动脉粥样硬化
E.主动脉瓣关闭不全
参考答案：D
治疗癫痫持续状态可首选（）
A．地西泮
B．卡马西平
C．硫酸镁
D．氯丙嗪
E．扑米酮
In the RGB color spaces, each pixel on the screen has a corresponding RGB value which consists of (71) components.
A) two B) three C) four D) six
