梯度回波序列的主要优点是
A．提高图像信噪比
B．提高空间分辨率
C．增加磁场均匀性
D．提高成像速度
E．减少噪声
参考答案：D
静脉补钾速度不宜过快，成年人滴速一般不超过（）
A.10滴／分
B.35滴／分
C.45滴／分
D.55滴／分
E.60滴／分
—Could you tell me _____?
—Certainly. In half an hour.[ ]
A. when will the train to Beijing leave
B. when the train to Beijing would leave
C. when the train to Beijing left
D. when the train to Beijing leaves
