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【单选题】
DNA复制能够准确无误地进行,保证了子代DNA分子的结构与DNA分子的结构相同,其根本原因是( )A.
DNA有独特的双螺旋结构
B.
碱基有严格的互补配对关系
C.
参与复制过程的酶有专一性
D.
复制过程有充足的能量供给
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【单选题】镜泊湖、长白山天池、云南滇池从成因上分类,属于( )
A.
咸水湖、火山口湖、溶蚀湖
B.
堰塞湖、火山口湖、构造湖
C.
成湖、冰川湖、构造湖
D.
溶蚀湖、堰塞湖、冰川湖
【单选题】Why did Jason become hesitant when he raced down the beach, out onto the jetty?
A.
Because his fear of water suddenly struck him.
B.
Because he was not willing to risk his own life.
C.
Because he was persuaded by his friend to stay away from the er.
D.
Because he found that there was no way to get to the boy from the jetty.
【单选题】镜泊湖、长白山天池、云南滇池从成因上分类,属于()
A.
咸水湖、火山口湖、溶蚀湖
B.
堰塞湖、火口山湖、构造湖
C.
风成湖、冰川湖、构造湖
D.
溶蚀湖、堰塞湖、冰川湖
【简答题】Why did Jason become hesitant when he raceddown the beach, out onto the jetty?
【单选题】镜泊湖、长白山天池、云南滇池从成因上分类，属于（ ）
A.
咸水湖、火口湖、溶蚀湖
B.
火山堰塞湖、火山口湖、构造湖
C.
风成湖、冰川湖、构造湖
D.
溶蚀湖、火山堰塞湖、冰川湖
【简答题】《砌体结构设计规范》(GB50003)中所列砌体强度设计值是按照施工质量等级为B级确定的,当施工质量等级不为B级时,应对砌体强度设计值进行调整。具体调整的方法就是,按《砌体结构设计规范》所查砌体强度设计值乘以调整系数 ,对于施工质量控制等级为C级的,其取值为 ;当施工质量控制等级为A级时,其取值为 。
【简答题】Where did the author arrive?(para1) 2、What's known for the place?(para1) 3、Why was he scared of water?(para3) 4、Why were a mob of people were runing into the sea?(para5) 5、Why did the author become he...
【简答题】补全对话 A. I seldom see them because I usually work in different places. B. We often act in the film all day and all night. C. You’re welcome. D. Why do you want to be an actor? E. Thank you so m...
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