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【单选题】
下列叙述中哪项有误( )A.
蛋白质多肽链中氨基酸残基的种类、数目、排列次序在决定它的二级结构、三级结构乃至四级结构中起重要作用
B.
主肽链的折叠单位～肽平面之间相关一个Ca碳原子
C.
蛋白质变性过程中空间结构和一级结构被破坏，因而丧失了原有生物活性
D.
维持蛋白质三维结构的次级键有氢键、盐键、二硫键、疏水力和力
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【单选题】听力原文：M: Are you the head resident? W: Yes. M: I'm Bill Miller. I'm here because I want to change roommates. W: Really? That surprises me. I thought that you and David were good friends. M: We were. Yo...
A.
The man wants to get authorization for a room change.
B.
The man is worried about his friendship with his roommate.
C.
The man needs a scholarship to continue living in the dormitory.
D.
The man wants the head resident to talk to David for him.
【简答题】柬埔寨的首都是( )
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