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当前学科：超声医学
题目：
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频谱多普勒技术可以用来测量多种数据，下列哪一种数据是不能测量的（）。
A . 收缩期血流速度
B . 搏动指数（PI）
C . 阻力指数（RI）
D . 血流平均速度（Vm）
E . 血管的内径
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