按要求完成下列各题1根据图1中的入射光线作出相应的折射光线.2如图2所示杠杆在力f1f2作用下处于平衡状态l1为f1的力臂.请 Template




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tomski按要求完成下列各题1根据图1中的入射光线作出相应的折射光线.2如图2所示杠杆在力f1f2作用下处于平衡状态l1为f1的力臂.请 coloring