【判断题】
用正投影的方法，假想人的视线为一组平行且垂直于投影面的投影线，将物体置于投影面与观察者之间，把看得见的轮廓用粗实线表示，看不见的轮廓用虚线表示，这样在投影面上所得的投影称为视图。（ ）
①
正确
②
错误
【单选题】
点在直线上，点的正投影一定在该直线的正投影上，点、直线在平面上，点和直线的正投影一定在该平面的正投影上，这种性质称为正投影的（ ）。
①
平行性
②
从属性
③
同素性
④
定比性
【单选题】
正投影法中，投影面、观察者、物体三者相对位置是( )
①
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人——面——物
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C. 人——物——面
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面——人——物