为了使计算简化，往往要把变形固体的某些性质进行抽象化和理想化，做一些必要的假设，同时又不影响计算和分析结果，对变形固体的基本假设主要有（）。

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【多选题】【消耗次数：1】

① 均匀性假设

② 连续性假设

③ 各向同性假设

④ 小变形假设

⑤ 平面体假设

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