该患者术前肠道准备下列哪项用药是错误的
A．蕃泻叶
B．硫酸镁
C．蓖麻油
D．甘露醇
E．乙二醇平衡液
参考答案：D
—How is your recent trip to Sichuan?
—I've never had ________one before.(2011·四川)
A．a pleasant
B．a more pleasant
C．a most pleasant
D．the most pleasant
离心泵的调速方法可分为几类？
