单选题When we say that two objects have relative motion, we mean （）.Athe distance between them remains the sameBthe distance between them is changingCthe position between them is not changingDtheir positions to the earth remain the same
单选题
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
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