根据“三级阶梯药物镇痛方案”常用于中等疼痛的药物为
A.吗啡
B.安痛定
C.杜冷丁
D.美撒痛
E.阿司匹林
参考答案:D
----Do you know where coffee was from first?
----It was said that coffee ______in Africa a long, long time ago.
A.discovered
B.invented
C.was invented
D.was discovered
被外国学者誉为“中国17世纪的工业百科全书”的是《________________》;魏源以“师夷长技以制夷”为目的而编写的书是《________________》。