如图所示装置物体b放在水平桌面上物体a通过�轮组拉住物体b此时物体b保持静止.小明用竖直�下大小为2n的力f1拉重为1n物体a时物体b Template




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tomski如图所示装置物体b放在水平桌面上物体a通过�轮组拉住物体b此时物体b保持静止.小明用竖直�下大小为2n的力f1拉重为1n物体a时物体b coloring