此患儿最可能的诊断是
A.房间隔缺损
B.室间隔缺损
C.肺动脉狭窄
D.动脉导管未闭
E.法洛四联症
参考答案:B
已知两个等比数列{an},{bn}满足a1=a(a>0),b1﹣a1=1,b2﹣a2=2,b3﹣a3=3,若数列{an}唯一,则a=( ).
_____, you have given me a lot of help.
A.Tell the truth
B.To tell the truth
C.Telling true
D.Telling truth