全国硕士研究生入学统一考试就是考研吗

完全性左束支传导阻滞时心电图的表现包括

A. QRS波群时限≥0.12s
B. V1、V2导联呈rS波或呈宽而深的QS波，Ⅰ、aVL、V5、V6导联R波增宽、顶峰粗钝或有切迹
C. Ⅰ、V5、V6导联q波一般不消失
D. V5、V6导联R峰时间＜0.06s

可经输血传播的疾病有( )

A.乙型肝炎
B.疟疾
C.甲型肝炎
D.丙型肝炎

In our contemporary culture,the prospect of communicating with--or even looking at--a stranger is virtually unbearable.Everyone around us seems to agree by the way they fiddle with their phones,even without a 1 underground.It's a sad reality--our desire to avoid interacting with other human beings--because there's 2 to be gained from talking to the stranger standing by you.But you wouldn't know it,3 into your phone.This universal armor sends the 4:"Please don't approach me."What is it that makes us feel we need to hide 5 our screens?One answer is fear,according to Jon Wortmann,executive mental coach.We fear rejection,or that our innocent social advances will be 6 as"creepy,".We fear we'll be 7.We fear we'll be disruptive.Strangers are inherently 8 to us,so we are more likely to feel 9 when communicating with them compared with our friends and acquaintances.To avoid this anxiety,we 10 to our phones."Phones become our security blanket,"Wortmann says."They are our happy glasses that protect us from what we perceive is going to be more 11.”But once we rip off the bandaid,tuck our smartphones in our pockets and look up,it doesn't 12 so bad.In one 2011 experiment,behavioral scientists Nicholas Epley and Juliana Schroeder asked commuters to do the unthinkable:Start a 13.They had Chicago train commuters talk to their fellow 14."When Dr.Epley and Ms.Schroeder asked other people in the same train station to 15 how they would feel after talking to a stranger,the commuters thought their 16 would be more pleasant if they sat on their own,"the New York Times summarizes.Though the participants didn't expect a positive experience,after they 17 with the experiment,"not a single person reported having been snubbed."18,these commutes were reportedly more enjoyable compared with those sans communication,which makes absolute sense,19 human beings thrive off of social connections.It's that 20:Talking to strangers can make you feel connected.14选？

A.trainees
B.employees
C.researchers
D.passengers

设矩阵的特征方程有一个二重根，求的值，并讨论A是否可相似对角化