设有一正平线，其水平投影（）。 - 查题网

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成人高等教育 / 实用电子工程制图

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设有一正平线，其水平投影（）。

A、
有积聚性
B、
平行于OX轴
C、
反映实长，且=90°
D、
反映实长，且α+β=90°

积分

实用电子工程制图

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