下列哪项是消化性溃疡的最常见病因？（）
A.幽门螺杆菌
B.遗传
C.急性应激
D.吸烟
E.胃十二指肠运动异常
参考答案：A
为预防压疮的发生，进行体位变换时每次间隔时间不得超过
A．1h
B．2h
C．3h
D．1.5h
E．2.5h
As is known to all，it is teachers and parents who will have a big _____ on the
development of children. [ ]
A. change
B. affection
C. influence
D. impression
