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离心泵的轴封通常采用哪些密封措施？各有什么特点？
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编制劳动定额常用的方法有（）。
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风湿性心脏病二尖瓣严重狭窄的X线表现应除外（）
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飞行驾驶员姿态遥控模式下操纵无人机下降时，下列正确的操纵是（）
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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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房地产产品的生产、交易和使用过程中，均需（）的参加。
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注塑模型腔和型芯的脱模斜度在任何情况下都必须控制在1°~3°范围内。
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可通过胎盘进入胎儿体内引起新生儿溶血病的血型抗体是（）
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沥青针入度试验标准针的直径为（）mm。
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磁场是用磁力线来描述的，磁铁中的磁力线方向始终是从N极到S极。