【单选题】【消耗次数：1】
若点在直线上，则点的各个投影必在直线的各同面投影上。
①
正确
②
错误
参考答案：
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点在直线上，点的正投影一定在该直线的正投影上，点、直线在平面上，点和直线的正投影一定在该平面的正投影上，这种性质称为正投影的（ ）。
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平行性
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