若直线在W面和V面的投影均为一条平行于Z轴的直线,则它是投影面的( )。答案A...

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【单选题】

若直线在W面和V面的投影均为一条平行于Z轴的直线,则它是投影面的( )。答案

正平线

水平线

铅垂线

侧垂线

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