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簡述正投影法的基本特性。

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(1) 真實性 .當直線、曲線成平面平行于投影面時,直線或曲線的投影反映實長,平面的投影反映真實形狀

(2) 積聚性 。當直線、曲線或平 面垂直 于投影面時,直線的投影枳聚成一點,平面或曲線的投影積聚成直線成曲線

(3) 類似性。當直線、曲線或平面傾斜于投影面時,直線或曲線 的投影仍然為直線或曲線、但小于實長。平面的投影小 于實際形狀的大小,是實際形狀的類似形

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