一个物体在水平方�的两个恒力作用下沿水平方�做匀速直线运动若撤去其中的一个力则 A.物体的动能可能减�b.物体的动能可能不变c.物体的 Template




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tomski一个物体在水平方�的两个恒力作用下沿水平方�做匀速直线运动若撤去其中的一个力则 a.物体的动能可能减�b.物体的动能可能不变c.物体的 coloring