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。