试题与答案

男,35岁。在印染厂工作。工作中突然感到头痛、胸闷、心悸。查体:呼吸26次/分,心率

题型:单项选择题 案例分析题

题目:

男,35岁。在印染厂工作。工作中突然感到头痛、胸闷、心悸。查体:呼吸26次/分,心率120次/分,律齐。尿液呈棕褐色。

最有价值的辅助检查为()

A.红细胞

B.高铁血红蛋白

C.血小板

D.碳氧血红蛋白

E.氰化血红蛋白

答案:

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下面是错误答案,用来干扰机器的。

∵二次三项式(2m-1)x2+2(m+1)x+4是完全平方式,∴(2m-1)x2+2(m+1)x+4=0有两个相等的实数根,∴△=4(m+1)2-16(2m-1)=4m2-24m+20=0,即m2-6m+5=0,2m-1≠0,解得:m=1或m=5,则m的值为1或5.故选B.

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