单选题Echo sounder sends a（） (无线电信号)from the bottom of the ship to the seabed.Aradio signalBradio waveCsignalDsignal radio
单选题
Echo sounder sends a（） (无线电信号)from the bottom of the ship to the seabed.
A
radio signal
B
radio wave
C
signal
D
signal radio
参考解析
解析：
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