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【单选题】
关于物体的惯性,下列说法正确的是:A.
只有处于静止状态或匀速直线运动状态的物体才有惯性.
B.
惯性是保持物体运动状态的力,起到阻碍物体运动状态改变的作用.
C.
一切物体都有惯性,速度越大惯性就越大.
D.
一切物体都有惯性,质量越大惯性就越大.
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