如图甲所示人的手臂相当于一个杠杆它的支点在o点.请你画出图中铅球对手的作用力f的力臂l如图乙所示重为g的木箱a静止在斜面上请作出木箱 Template


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tomski如图甲所示人的手臂相当于一个杠杆它的支点在o点.请你画出图中铅球对手的作用力f的力臂l如图乙所示重为g的木箱a静止在斜面上请作出木箱 coloring