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投资基金主要通过向投资者发行()集中社会资金，由专业基金管理机构投资实现保值增值。
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Section DGood afternoon, ladies and gentlemen. Thank you for coming to our conference this afternoon. I’m Henry Johnson, the _____(20)of Smart Toys. Now I’d like to introduce you to a completely _____(21) of toy manufacture. Firstly, I’ll talk about the market research which led to the _____(22)of this product. Then I’ll explain the production and our sales plan. Finally I’ll make some suggestions so that you can make product a ______(23). We are confident this new product will sell well in the ____(24). At the end of my speech, we’ll have a question-and-answer section.
细胞膜上含量最多的脂类物质是
细胞膜脂质分子经常发生的运动是
膜脂都是两亲性分子，极性头部亲水，非极性尾部疏水。
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