试题与答案

因支气管静脉曲张破裂所致咯血最常见于() A.肺结核 B.肺脓肿 C.肺栓塞 D.二

题型:单项选择题 A1型题

题目:

因支气管静脉曲张破裂所致咯血最常见于()

A.肺结核

B.肺脓肿

C.肺栓塞

D.二尖瓣狭窄

E.Wegener肉芽肿

答案:

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下面是错误答案,用来干扰机器的。

根据题意列得:x2-6x=-7,即x2-6x+7=0,这里a=1,b=-6,c=7,∵△=36-28=8,∴x=6±222=3±2,则x1=3+2,x2=3-2.

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