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【多选题】
直线的一次换面 可以将一般位置直线变换为投影面平行线,从而求得()A.
直线的实长
B.
直线对某一投影面倾角的真实大小
C.
直线到 H 面的距离
D.
直线到新投影面的距离
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A.
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B.
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C.
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