【单选题】
正投影图是（ ）。
①
用中心投影法绘制的单面投影图
②
用平行投影的正投影法绘制的多面投影图
③
用平行投影的正投影法绘制的单面投影图
④
是在物体的水平投影上加注某些特征面、线以及控制点的高度数值的单面正投影
【单选题】
正投影法是指：( )
①
投射线都相交于投射中心，投射出形体投影的方法
②
投射线互相平行且垂直于投影面，投射出形体投影的方法
③
由互相平行的投射线投射出形体投影的方法
④
投射线互相平行且倾斜于投影面，投射出形体投影的方法
【单选题】
正投影法中，投影面、观察者、物体三者相对位置是( )
①
Normal
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X-NONE
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人——面——物
②
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物——人——面
③
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C. 人——物——面
④
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面——人——物