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Outdoor fire hydrant pipe network form (ring and branch) and pipe diameter, number of fire hydrants, outdoor fire hydrant layout.Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.秋霜恹恹地笑了下，道：我先想想再说。故事讲述的是小主人公罗小布将自己的快乐卖给了忧愁国的收购员毛卷卷，以换取每次考试的100分、每次玩游戏都赢和每天两个不同口味的冰激凌。可是他发现失去快乐，拥有再多的愿望也无济于事。于是，罗小布让毛卷卷把自己变小，和新认识的小伙伴月亮狗一起，踏上了寻找快乐的艰辛旅程。在寻找快乐的过程中结识三个活泼快乐精灵，最终一起打败忧愁国疙瘩王！罗小布也真正明白了快乐的含义，知道快乐是多么的重要！1. First open AI software.This is the difference between the thinking of the poor and the thinking of the rich: the thinking of the poor is characterized by living within our means, while the thinking of the rich is characterized by goal orientation.6. Cao Zaixian