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【单选题】
关于物体的惯性,下列说法正确的是 ( )A.
只有处于静止或匀速直线运动的物体才具有惯性
B.
只有运动的物体才能表现出它的惯性
C.
物体做变速运动时，其惯性不断变化
D.
以上说法均不正确
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A.
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