呕吐大量隔夜宿食的是（）
A.幽门梗阻
B.十二指肠淤积症
C.小肠梗阻
D.胃潴留
E.胃癌
参考答案：A
Einstein's Theory of Relativity is so________that most of us can not understand it. [ ]
A. controversial
B. abstract
C. appropriate
D. universal
擅自发车、开车、停车，错办通过或在区间乘降所错误通过，定为险性事故。
