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简述防寒保温外覆盖材料的种类。
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发生铁路交通事故，造成多少人死亡列为特别重大事故？
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下列含碘酪氨酸衍生物中哪种生物活性最强（）
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变配电所装有两台硅整流装置，其中一台容量较小，在直流"+"极间用二极管VD隔离。其作用是防止较小容量的整流柜向合闸母线供电，从而保证操作电源可靠。
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2008年，在国际金融危机背景下，我国实施的货币政策包括（）。
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下面对测量系统分析的陈述中，选择所有正确的项目（）
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除解肌退热外，又能生津止渴的药是（）
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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.
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在科技排版符号中：“⊙”符号所表示的是圆。
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瓦斯的比重比空气轻，易聚集于巷顶。