题目: 设{an}是正项等差数列,{bn}是正项等比数列,且a1=b1,a2n+1=b2n+1则[ ]A.an+1=bn+1B.an+1≥bn+1C.an+1≤bn+1D.an+1<bn+1 答案: 答案:B
题型:单项选择题 A1/A2型题 孕妇,32岁,停经55天, * * 少量流血6天,因出血量增多2小时就诊。妇检:子宫颈口扩张,少量宫腔内容物堵子宫颈口,子宫体略大;尿HCG(+),首先考虑为()。A.稽留流产B.不全流产C.先兆流产D.难免流产E.完全流产 查看答案