如上图所示物体在水平拉力f的作用下沿水平桌面匀速�右运动下列说法中正确的是 A.物体所受拉力和重力是一对平衡力 b.桌面对物体的支持 Template




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tomski如上图所示物体在水平拉力f的作用下沿水平桌面匀速�右运动下列说法中正确的是 a.物体所受拉力和重力是一对平衡力 b.桌面对物体的支持 coloring