在β-内酰胺环上含有6-甲氧基的药物是
A．青霉素B．阿莫西林C．氨苄西林D．替莫西林E．哌拉西林
参考答案：D
Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes.
A．exclude
B．excluding
C．include
D．are included
急性重症胆总管炎病人梗阻原因主要是（）
A．胆管结石
B．胆管畸形
C．胆管肿瘤 kao12
D．胆道狭窄
E．胆道蛔虫
