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当前学科：第六章天气
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什么是植物的光周期现象？根据光照长度影响植物开花的情况可将植物分为哪几类？分类的具体依据是什么？
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Lainey finished third grade. She had good grades and could read grade level, but she did not like to read. On a family car trip, her Aunt Dede pulled out a copy of Harry Potter, as a surprise for her . But Lainey took one look at it, her eyes, and said, “ Borring !”Aunt Dede, a teacher, had read the book to her students, and they loved it. the youngest children in the class were by the story. They with great interest and then joined in grand conversations about Harry`s adventures.“How can you say it`s ? Have you read it? ” asked Aunt Dede.“No, it`s too long and it doesn`t have any .” complained Lainey.“Oh, that`s where you are ;there are lots of pictures. Every page is full of pictures; you just have to read the words to them. It`s like magic.”“Nice try , Aunt Dede,”Lainey replied from the back seat.Another was in order. “Well, if you don’t want to read it, give it .Maybe your mom would hearing the story.” The book sailed through the air to Aunt Dede and she began to read it aloud. By the end of the first chapter, were coming from the back seat:“Please read a little .”Lainey is an example of an reader. As shown here, Lainey can become about reading when with literature on topics that interest her, and when the people around her model involvement in the reading process.
试述离心式压缩机叶轮的结构组成及其作用？