不定项选择关于速度和加速度的认识中正确的是a.速度方�和加速度方�一定相同b.有加速度的物体速度一定增加c.物体速度�生变化必有加速度d Template




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tomski不定项选择关于速度和加速度的认识中正确的是a.速度方�和加速度方�一定相同b.有加速度的物体速度一定增加c.物体速度�生变化必有加速度d coloring