数学一道视图与投影题.一根笔直的小木棒(记为线段AB),它的正投影为线段CD,则有:A.AB大于等于CD B.AB小于等于CD
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![数学一道视图与投影题.一根笔直的小木棒(记为线段AB),它的正投影为线段CD,则有:A.AB大于等于CD B.AB小于等于CD](/uploads/image/z/4819004-44-4.jpg?t=%E6%95%B0%E5%AD%A6%E4%B8%80%E9%81%93%E8%A7%86%E5%9B%BE%E4%B8%8E%E6%8A%95%E5%BD%B1%E9%A2%98.%E4%B8%80%E6%A0%B9%E7%AC%94%E7%9B%B4%E7%9A%84%E5%B0%8F%E6%9C%A8%E6%A3%92%EF%BC%88%E8%AE%B0%E4%B8%BA%E7%BA%BF%E6%AE%B5AB%EF%BC%89%2C%E5%AE%83%E7%9A%84%E6%AD%A3%E6%8A%95%E5%BD%B1%E4%B8%BA%E7%BA%BF%E6%AE%B5CD%2C%E5%88%99%E6%9C%89%EF%BC%9AA.AB%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8ECD+B.AB%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8ECD)
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