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搜题/搜资源
【单选题】【消耗次数:1】
当平面平行于投影面时,平面在该投影面上的投影( )。
①
为一形状类似但缩小了的图形
②
反映实形
③
积聚成一条曲线
④
积聚成一条直线
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当一条直线平行于投影面时,在该投影面上反映( )。
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当一条直线垂直于投影面时,则在该面上反映实形性。
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平行于投影面的直线,在该投影面上有积聚性
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【单选题】
直线平行于投影面,其投影反映直线的实长;平面图形平行于投影面,其投影反映平面图形的实形。是正投影法的基本性质中的( )。
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直线平行于投影面,其投影反映直线的实长;平面图形平行于投影面,其投影反映平面图形的实形。是正投影法的基本性质中的[填空]。
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【单选题】
当直线、平面与投影面平行时,该投影面上的投影具有( )
①
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④
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【单选题】
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