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【单选题】
关于彩色多普勒诊断下肢静脉瓣功能不全，以下正确的描述是
A.
静脉血流速度增快
B.
静脉血流速度减慢
C.
静脉血流信号不连续
D.
在远端加压时出现持续1秒的反向血流
E.
静脉血流信号变细
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【简答题】Did you hear that Ben was fired last month? He (work) for that import company for more than ten years and he (work) in almost every department. Nobody knew the company like he did.
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