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【单选题】
一质点沿【图片】轴运动的规律是【图片】,其中【图片】以m计,【图片】以s计。前3s内它的( )。
A.
位移和路程都是3m
B.
位移和路程都是-3m
C.
位移是-3m,路程是3m
D.
位移是-3m,路程是5m
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A.
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A.
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