【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
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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人——面——物
②
Normal
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7.8 磅
0
2
false
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ZH-CN
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物——人——面
③
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C. 人——物——面
④
Normal
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7.8 磅
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2
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ZH-CN
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面——人——物
【单选题】
点的正投影仍然是点，直线的正投影一般仍为直线（特出情况例外），平面的正投影一般仍为原空间几何形状的平面（特殊情况例外），这种性质称为正投影的（ ）。
①
从属性
②
平行性
③
同素性
④
定比性