【单选题】【消耗次数：1】
与正立投影面平行的平面，我们称为______
①
正平面
②
水平面
③
侧平面
参考答案：
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②
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③
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④
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【简答题】
求圆柱螺线x=acost,y=asint,z=bt的曲率和挠率