设函数y=f(x)的图象在[a，b]上连续，若满足（），方程f(x)=0在[a

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问题填空题

设函数y=f(x)的图象在[a，b]上连续，若满足（），方程f(x)=0在[a，b]上有实根．

答案

f(a)f(b)≤0

选择题

I always look _____ those who never look _____ others, even though they have achieved great

achievements. [ ]

A. down on; up to

B. down upon; up to

C. forward to; down on

D. up to; down on

单项选择题

判断代偿型呼吸性碱中毒的指标是

A．血浆pH正常，HCO₃^-升高，PCO₃^-下降
B．血浆pH下降，HCO₃^-下降，PCO₂升高
C．血浆pH正常，HCO₃^-下降，PCO₂下降
D．血浆pH正常，HCO₃^-下降，PCO₂下降
E．血浆pH正常，HCO₃^-升高，PCO₂升高