青霉素的化学结构
A．甲硝唑B．枸橼酸乙胺嗪C．枸橼酸哌嗪D．奎宁E．吡喹酮
参考答案：E
泪道冲洗有阻力，部分清水自泪点反流，部分流入鼻腔，表明
A．泪小管阻塞
B．鼻泪管阻塞和泪小管狭窄
C．鼻泪管阻塞
D．鼻泪管阻塞合并慢性泪囊炎
E．泪总管狭窄或鼻泪管狭窄
（）of his wealth, John is not very happy.
A.Beside
B.Because of
C.In spite of
D.Besides
