问题
单项选择题
B型超声是指（）
A.振幅调制型
B.辉度调制型
C.彩色血流显像
D.多普勒频谱显示
E.以上都不是
答案
参考答案：B
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B型超声是指（）
A.振幅调制型
B.辉度调制型
C.彩色血流显像
D.多普勒频谱显示
E.以上都不是
参考答案：B
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