题目内容

以下说法正确的是（）。

A. 斜轴测图中，投射线垂直于轴测投影面。
B. 正轴测图中，投射线垂直于轴测投影面。
C. 正轴测图中，投射线倾斜于轴测投影面。
D. 轴测图中，投射线是否垂直于轴测投影面，对轴测图没有影响。

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