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正垂面上的圆在V面上的投影为____ ,在H面上的投影形状为____ 。
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正垂面上的圆在V面上的投影为____ ,在H面上的投影形状为____ 。
时间：2021-09-08 15:35
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青书学堂
平顶山学院
机械制图(专升本)
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直线@#@椭圆
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