平面图形(或直线)平行于投影面时,其投影具有___;平面图形(或直线)垂直于投影面时,其投影具有___;平面图形(或直线)倾斜于投影面时,其投影具有___; A 、透视性; B、类似性; C、真实性; D、积聚性
A.
透视性
B.
类似性
C.
真实性
D.
积聚性
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