直线平行于投影面，其投影反映直线的实长；平面图形平行于投影面，其投影反映平面图形的实形。是正投影法的基本性质中的（）。

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【单选题】【消耗次数：1】

① 类似性

② 平行性

③ 从属性

④ 实形性

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