方程(2y+1)(2y-3)=0的根是______.
∵(2y+1)(2y-3)=0,
∴2y+1=0或2y-3=0,
解得y1=-12,y2=32.
________ many times, he still couldn’t understand it.
A.Told
B.Being told
C.Having been told
D.Having told
小儿,5个月,2个月前出现面部灰暗,哭闹及吃奶时出现发绀。查体:较瘦,口周发绀,心前区可闻及Ⅲ级左右的收缩期喷射音,X线示:右心室肥大,肺动脉段凹陷,心脏呈靴形,肺野清晰。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