一、选择题(每题2分,共30分)1.在图1所示的简单机械中,属于费力杠杆的是().2.图2所示的是修剪树枝使用的剪刀,某园艺工人在使用此剪刀剪树枝时,常把树枝尽量向剪刀转动轴O处靠近,他这样做的目的是为了().A.增大阻力臂,减小动力移动的距离B.减小动力臂,减小动力移动的距离C.增大 First, the multiple-choice questions (2 points for each question, a total of 30 points) 1. In the simple machine shown in Figure 1, is a laborious lever is ().2. Figure 2 shows the scissors used to trim tree branches, a gardening When workers use this scissors to cut branches, they often try to move the branches close to the axis of rotation O of the scissors. The purpose of this is to (). A. Increase the resistance arm and reduce the distance the power moves. B. Decrease the power arm. , reduce the distance of power movement C. increase