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【单选题】
为延长脂质体在统内循环时间,通常使用修饰的磷脂制各长循环脂质体,常用的修饰材料是()A.
甘露醇
B.
聚山梨醇
C.
山梨醇
D.
聚乙二醇
E.
聚乙烯醇
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【单选题】听力原文：W: How do you usually spend your day, Paul? M: I usually get up at seven. I take a shower and dress and then I have breakfast at seven thirty. I leave the house at eight. I work from nine to five...
A.
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B.
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C.
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