（）is a radio receiver with ablity to sense direction of the incoming radio waves.<br>A:The echo sounder<br>B:The radar<br>C:The course recorder<br>D:The direction finder

（）is a radio receiver with ablity to sense direction of the incoming radio waves.
A:The echo sounder
B:The radar
C:The course recorder
D:The direction finder

出自：海船船员证

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