下图为南半球的一段纬线，图中M 、N 两点为北半球夏至日晨昏线与该纬线的交点。读

关于房颤的心电图改变下列错误的是（）

A.心房率350～600次/分

B.心室率不规则

C.快速房颤室率可达180～250次/分

D.可出现室内差异性传导

E.伴R-R>1.5s常提示存在二度房室传导阻滞

______, I believe, and you will find the student is very outgoing.

A．One talk with him

B．Given a talk with him

C．Having a talk with him

D．If you have a talk with him

根据构造原理，下列关于7号元素的基态原子的外围电子排布式正确的是（　　）

缺铁                      易患地方性甲状腺肿

缺碘                      易患贫血                                                                           

缺维生素D                   易患坏血病

缺维生素C                   易患佝偻病

“胸中块垒”的典故与下列哪一位人物相关？（）

A.嵇康

B.谢安

C.阮籍

D.孔融