胃溃疡,Hp检查阳性应首选()十二指肠球部溃疡,反复治疗疗效差宜选()
A.得乐冲剂
B.丙谷胺
C.雷尼替丁
D.洛赛克
E.氢氧化铝凝胶
参考答案:A,D
In the past few years, there _____ great changes in my hometown. [ ]
A. have been
B. were
C. has been
D. was
PP环切换条件为(),MSP环切换条件为()、()、()、()、()。