对门静脉高压诊断有特征意义的是（）。
A.肝掌，蜘蛛痣
B.食管和胃底静脉曲张
C.脾大，脾功能亢进
D.右侧胸水
E.顽固性腹水
参考答案：B
哪项不是CR摄像的优点（）
A.实现常规X线摄影信息数字化
B.提高图像密度分辨力
C.辐射剂量降低
D.多信息显示
E.时间分辨力好
(2013·合肥模拟)— bargaining is so interesting?
—Sometimes it is a test to see who can stand their ground for the longest.
A．What is it that
B．Why is it that
C．What it is that
D．Why it is that
