第4题: [单项选择]What is special about open-access journals A. A higher frequency of citation. B. A collection of valuable data. C. Hard-won prominence. D. Established reputation. 参考答案:A
第27题: [单项选择]慢性肾功能衰竭当血肌酐(Scr)浓度和内生肌酐清除率(Ccr)为
提示肾功能不全失代偿期的是() A. Scr<176μmol/L,Ccr50~80ml/min B. Scr88~132μmol/L,Ccr80~100ml/min C. Scr>707μmol/L,Ccr<10ml/min D. Scr450~707μmol/L,Ccr10~25ml/min E. Scr177~442μmol/L,Ccr20~50ml/min 参考答案:D 答案解析: