题目内容
从移动的发射体获得的多普勒频移( )
2021-10-14
A.当多普勒人射角接近0°时最大
B.是发射和接收频率之和
C.多普勒角度为90°时最强
D.多普勒角度小于90°时为负向频移
E.是频率的平方根
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