胃大部切除术后胃肠减压的作用包括
A．减轻腹胀
B．避免呕吐
C．防止胃内容物外漏
D．有利于吻合口的愈合
E．防止出血
参考答案：A,B,C,D
Shanghai is larger than_________in Jiangsu, and it is larger than_________ in China.
A．any other city, any city
B．any city, the other cities
C．the other cities, any other city
D．any cities, any city
简述学生指导的德育意义。
