男，70岁，进行性吞咽困难半年，结合图像，最可能的诊断为（）
A.正常食管
B.食管静脉曲张
C.食管平滑肌瘤
D.贲门失弛缓
E.食管癌
参考答案：E
-________.
-I'm sorry. But I don't know why you are so angry with me. [ ]
A．I have had enough of you
B．That was a nightmare
C．I have got that
D．That's a good point
已知二次三项式x2+mx+9能用完全平方公式分解因式，则m的值为______．
