发布时间:2025-01-31 20:52:01
(1)剪树枝时,用剪刀口的中部,而不用剪刀尖,减小了阻力臂,在阻力、动力臂一定的情况下,根据杠杆的平衡条件知道减小了动力、更省力;
(2)省力杠杆和费力杠杆的依据是看动力臂和阻力臂的长短,即动力臂长的是省力杠杆;动力臂短的是费力杠杆;动力臂和阻力臂相等的是等臂杠杆;
想买一款颜色比较个性比较鲜亮的冰箱放客厅里搭配家居不知道那个牌子有看着比较年轻的款式
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