【单选题】【消耗次数:1】
水平面与侧垂面相交,其交线是()
侧垂线
水平线
一般线
正平线
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【单选题】 正垂面与侧垂面相交,其交线是()
①  侧垂线
②  水平线
③  一般线
④  正平线
【单选题】 当两个侧垂面相交,其交线应为一( )。
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②  侧垂线
③  正垂线
④  水平线
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②  水平线
③  铅垂线
④  正平线
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