如图所示一物体在粗糙水平地面上受斜�上的恒定拉力f作用而做匀速直线运动则下列说法正确的是 A.物体可能不受弹力作用b.物体一定受四个力 Template


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tomski如图所示一物体在粗糙水平地面上受斜�上的恒定拉力f作用而做匀速直线运动则下列说法正确的是 a.物体可能不受弹力作用b.物体一定受四个力 coloring