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The radio waves used for radar are very short，only（）long.
The radio waves used for radar are very short，only（）long.
A.a few centimeters
B.a few fathoms
C.a few meters
D.a few feet
正确答案：a few centimeters
标签：
航海英语
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The ARPA may swap targets when automatically tracking if two targets（）
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When hitting a solid object such as a ship or an airplane， the radar waves are reflected back（）they came.