Some radio waves（）the surface of the earth because of its（）.<br>A:are capable of following / distance<br>B:can follow / altitude<br>C:can hardly follow / shape<br>D:are unable following / angle

Some radio waves（）the surface of the earth because of its（）.
A:are capable of following / distance
B:can follow / altitude
C:can hardly follow / shape
D:are unable following / angle

出自：海船船员证

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