由于水资源缺乏,B、C两地不得不从黄河上的扬水站A处饮水,这就需要在A、B、C之间铺设地下管道.有人设计了三种方案:如图甲实现表示管道铺设路线,在图乙中,AD⊥NC于D,在图丙中,OA=OB=OC,为减
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![由于水资源缺乏,B、C两地不得不从黄河上的扬水站A处饮水,这就需要在A、B、C之间铺设地下管道.有人设计了三种方案:如图甲实现表示管道铺设路线,在图乙中,AD⊥NC于D,在图丙中,OA=OB=OC,为减](/uploads/image/z/2341503-63-3.jpg?t=%E7%94%B1%E4%BA%8E%E6%B0%B4%E8%B5%84%E6%BA%90%E7%BC%BA%E4%B9%8F%2CB%E3%80%81C%E4%B8%A4%E5%9C%B0%E4%B8%8D%E5%BE%97%E4%B8%8D%E4%BB%8E%E9%BB%84%E6%B2%B3%E4%B8%8A%E7%9A%84%E6%89%AC%E6%B0%B4%E7%AB%99A%E5%A4%84%E9%A5%AE%E6%B0%B4%2C%E8%BF%99%E5%B0%B1%E9%9C%80%E8%A6%81%E5%9C%A8A%E3%80%81B%E3%80%81C%E4%B9%8B%E9%97%B4%E9%93%BA%E8%AE%BE%E5%9C%B0%E4%B8%8B%E7%AE%A1%E9%81%93.%E6%9C%89%E4%BA%BA%E8%AE%BE%E8%AE%A1%E4%BA%86%E4%B8%89%E7%A7%8D%E6%96%B9%E6%A1%88%EF%BC%9A%E5%A6%82%E5%9B%BE%E7%94%B2%E5%AE%9E%E7%8E%B0%E8%A1%A8%E7%A4%BA%E7%AE%A1%E9%81%93%E9%93%BA%E8%AE%BE%E8%B7%AF%E7%BA%BF%2C%E5%9C%A8%E5%9B%BE%E4%B9%99%E4%B8%AD%2CAD%E2%8A%A5NC%E4%BA%8ED%2C%E5%9C%A8%E5%9B%BE%E4%B8%99%E4%B8%AD%2COA%3DOB%3DOC%2C%E4%B8%BA%E5%87%8F)
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