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问题 单项选择题

女，16岁，无月经来潮，有周期性下腹痛病史，疑诊处女膜闭锁。作可种检查可确诊（）

A.处女膜检查

B.B型超声检查

C.穿刺检查

D.肛诊检查

E.双合诊检查

答案

参考答案：A

填空题

等差数列{an}中，a1=25，S9=S17，则数列前______项和最大．
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选择题

Wang kun : Have you looked at a map?

Wang wei : What did you say just now?

Wang kun : I asked you ______________.

A．whether you have looked at a map

B．whether you had looked at a map

C．whether have you looked at a map

D．whether had you looked at a map
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