【简答题】
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【单选题】
已知点A(20,20,10),点B(20,25,30),则( )产生重影点。
【简答题】
<img src="http://huaweicloudobs.ahjxjy.cn/184875808a5e62da21bc176ba55dd3fd.png" width="418" height="144" style="width: 418px; height: 144px;"/>
【单选题】
A点坐标为(10、20、30),B点坐标为(30、20、30)则AB距离为______。
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铅垂线
【判断题】
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【单选题】
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①
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【单选题】
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①
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【单选题】
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①
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②
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③
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④
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