GERD患者的治疗阶段分为()
A.PPITest
B.胃镜治疗
C.初始治疗
D.长期维持
参考答案:A, C, D
计算:
(1)(-2a3bc)2•(-ab2)3
(2)(2x-1)2(2x+1)2.
I turned back only to find an old schoolmate whose name ______ me for the moment.
A.avoided
B.escaped
C.failed
D.slipped