患者肺炎反复发作,结合图像,最可能的诊断为()
A.食管癌
B.贲门失弛缓症
C.胃食管)返流
D.硬皮病
E.以上都不是
参考答案:B
-Sorry, I made a mistake again.
-______ Practice more and you '11 succeed. [ ]
A. Never mind
B. That's OK
C. Happy to hear that
D. Thank you
异程式采暖系统的优点在于( )。
A.易于平衡
B.节省管材
C.易于调节
D.防止近热远冷现象