题目内容
可使接收频率增大,振动源或接收体的运动应( )
2021-10-14
A.振动源接收体等速背向运动
B.接收体向振动源运动
C.振动源背离接收体运动
D.振动源接收体等速度同向运动
E.接收体背离振动源运动
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