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【简答题】
多普勒超声的描述下列哪一项是错误的? A.主要分为连续波和脉冲波多普勒 B.脉冲波多普勒具有距离选通性 C.连续波多普勒不具有距离选通性 D.脉冲多普勒，脉冲重复频率越高，可测量血流速度越高 E.显示多普勒频谱可直接向血流量
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【简答题】一般平均数（静态平均数）的种类。
【单选题】According to the writer, what advantage does e-mall correspondence have over the traditional letter?
A.
It is more convenient to send.
B.
It causes fewer misunderstandings.
C.
It can be written in a less conversational style.
D.
It does not have the same time-consuming conventions.
【单选题】What advantage does TV have over newspapers?
A.
It can give news quickly.
B.
It can show more.
C.
You don't have to read anything.
D.
It has a more objective viewpoint.
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