下列各项正确的是（）。 ["A、历史事件有重复性","B、历史现象是个别的、具体的、不可重复的","C、历史现象是独一无二的","D、历史必然性是不以人的意志为转移的"]
下列碘过敏试验方法，哪项是错误的() ["A．眼结膜试验 ","B．皮下试验 ","C．舌下试验 ","D．口服法试验 ","E．静脉注射法试验"]
下列防护物质中，最理想的防护物是() ["A．建筑材料 ","B．铅 ","C．铜 ","D．铁 ","E．铝"]
非离子型对比剂是() ["A．泛影葡胺 ","B．优维显 ","C．泛影钠 ","D．碘苯酯 ","E．胆影葡胺"]
C.试述子宫的位置和正常姿势。
何谓阴道穹窿?有何意义?
