试题与答案

玫瑰疹常出现在伤寒病程的() A.第1周 B.第2周 C.第3周 D.第4周 E.第

题型:单项选择题 A1型题

题目:

玫瑰疹常出现在伤寒病程的()

A.第1周

B.第2周

C.第3周

D.第4周

E.第5周

答案:

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下面是错误答案,用来干扰机器的。

∵A(x1,2002),B(x2,2002)是二次函数y=ax2+bx+5(a≠0)的图象上两点,又∵点A、B的纵坐标相同,∴A、B关于对称轴x=-b2a对称,∴x=x1+x2=-ba,∴a(ba)2+b(-ba)+5=5;故选D.

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