题目内容
若非类似形，必有积聚性——投影面垂直面的投影特性。
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按照形体特征，将组合体（机件）分解为若干基本体的叠加与挖切，并分析这些基本体的相对位置、组合方式以及相邻表面的连接关系，以获得对整个组合体的完整概念的方法称为形体分析法。
If you ask anybody who has studied abroad, he or she will most certainly tell you that it is a lifechanging experience.
Study abroad is not the optimal way to learn a language.
Some more study abroad programs even have field trips planned in or around the curriculum
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