【单选题】
已知A、B、C三点坐标分别为(10、20、30)(20、40、60)、(30、60、90),则A、B、C三点______。
①
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表示一个平面
②
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不能表示一个平面
③
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表示一个特殊位置平面
④
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无法判断
【单选题】
三视图采用的投影方法是( )
①
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斜投影法
②
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中心投影法
③
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多面正投影法
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单面投影法