题目：
超声波在软组织中传播的平均速度为（）。
A.1540英尺/秒
B.1540米/秒
C.1540厘米/秒
D.3400米/秒
E.340米/秒
答案：
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超声波在软组织中传播的平均速度为（）。 A.1540英尺/秒 B.1540米/秒 C
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