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杠杆能否平衡的选择题,学生解答甚感困难,究其原因,是学生对这类选择题的解答,方法单一,举措无双,现举数例以说明这类选择题的一些特殊解法,供参
The question of whether or not levers can be balanced is very difficult for students to answer. The reason is that students have answers to this type of multiple-choice questions. The methods are single and the measures are unparalleled. Several examples are given to illustrate some special solutions to this type of multiple-choice questions. Senate