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问题
单项选择题
彩色多普勒成像时不影响帧频的因素是
A．角度大小
B．深度
C．探头频率
D．滤波器
E．脉冲重复频率
答案
参考答案：
D
单项选择题
用HTML语言进行页面描述时，第一个标记是
A．
B．
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