【单选题】抗体类别转换时,发生基因重排的区域是
A.
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【判断题】传播沟通是公共关系的重要手段与机制,是社会组织联系公众的“纽带”和桥梁。传播沟通在公共关系中的作用既有利于社会组织,也有利于社会公众。
【单选题】2015年版第五套人民币100元纸币安全线透光观察可见( )文字。
【单选题】在正常生产时,应尽可能地控制好加氢裂化反应器各催化剂床层的入口温度,使它们( )
【多选题】Why do some poets frequently change syntax?
A.
To achieve their unique poetic of rhetorical effects.
B.
To reflect the speaker or the poet's mental feelings.
C.
To create an effect of euphony and reach rhythmic harmony.
D.
To place certain emphasis on particular words of phrases.