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[单选题]
一个木块在光滑的水平面上做匀加速直线运动,则物体的(??)
A
机械能增加,内能不变
B
机械能不变,内能增加
C
机械能、内能都不变
D
机械能、内能都增加
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试题答案:
A
答案解释:
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