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吊桶灭火
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吊桶灭火
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吊桶灭火
利用直升机外挂吊桶(囊)载水,从空中直接将水喷洒到火头、火线上方进行扑救森林火灾。在中国东北、内蒙古和西南林区已普遍使用。
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vertex of a plane curve
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