下列说法正确的是 A.一对相互作用力的合力为零b.物体只有重心处受到重力的作用c.物体在一恒力作用下可能做曲线运动d.力是矢量位移是矢量 Template




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tomski下列说法正确的是 a.一对相互作用力的合力为零b.物体只有重心处受到重力的作用c.物体在一恒力作用下可能做曲线运动d.力是矢量位移是矢量 coloring