如图所示原来静止的物体a在水平拉力f作用下沿水平面做直线运动速度逐渐增大则拉力fa.一定大于阻力ff B.一定等于阻力ff C Template




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tomski如图所示原来静止的物体a在水平拉力f作用下沿水平面做直线运动速度逐渐增大则拉力fa.一定大于阻力ff b.一定等于阻力ff c coloring