问题
单项选择题
（）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
答案
参考答案：D
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（）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
参考答案：D