蛛网膜下腔出血最常见的原因是
A．先天性脑底动脉瘤
B．颅脑外伤
C．血液病
D．血管畸形
E．动脉粥样硬化
参考答案：A
-I don't know about you, but I'm sick and tired of this weather.
-_______. I can't stand all this rain.
A．I don't care
B．It's hard to say
C．So am I
D．I hope not
检查乙炔发生器是否泄露，应用（）严禁（）。
