When we say that two objects have relative motion, we mean （）.<br>A:the distance between them remains the same<br>B:the distance between them is changing<br>C:the position between them is not changing<br>D:their positions to the earth remain the same

When we say that two objects have relative motion, we mean （）.
A:the distance between them remains the same
B:the distance between them is changing
C:the position between them is not changing
D:their positions to the earth remain the same

出自：海船船员证

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