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【单选题】
平行投影法分为(  )

投影法和正投影
中心投影法和正投影
中心投影法和斜投影
轴测投影法和标高投影
【判断题】
3. 若直线空间不相交,那么它们各面投影不相交。( )

正确
错误
【判断题】
3. 若直线空间不相交,那么它们各面投影不相交。

正确
错误
【单选题】
如果直线在某一投影面上投影互相垂直,而且其中有一条直线平行于该投影面,则直线空间位置关系是( )。

不能确定
相交
平行
垂直
【单选题】
正投影法中,投影面、观察者、物体三者相对位置是( )

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【单选题】
与侧立投影平行直线,我们称为______

正平线
水平线
侧平线
【单选题】
与正立投影平行直线,我们称为______

正平线
水平线
侧平线
【单选题】
下列投影法中不属于平行投影是( )

中心投影
正投影
投影
【单选题】
直线、平面与投影平行时,该投影面上投影具有( )

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【判断题】
施工图中各图样,主要是用正投影法绘制

正确
错误