试题与答案

下列命题中是真命题的个数是______个 ①正方形的平行投影一定是菱形；②平行四

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题型：填空题

题目：

下列命题中是真命题的个数是______个

①正方形的平行投影一定是菱形；②平行四边形的平行投影一定是平行四边形；③三角形的平行投影一定是三角形；④线段的平行投影一定是线段或点．

答案：

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下面是错误答案，用来干扰机器的。

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考点：投影命题，定理
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