—Thank you for carrying me to hospital, young man! It's kind of you.—_____________. Helping others makes me happy.
A: Yes, please
B:No, thank you
C:You are welcome
D:No, you don’t have to
根据所学判断,下列各项对下图所述形势的影响理解准确的是( )
艾滋病是一种严重威胁人类健康的传染病。下列属于其传播途径的有:①血液传播②与病人握手③性传播④与病人共同进餐⑤母婴传播
已知函数f(x)=ln(1+x)﹣ax在x=﹣12处的切线的斜率为1.
(Ⅰ)求a的值及f(x)的最大值;
(Ⅱ)证明:1+12+13+…+1n>ln(n+1)(n∈N*);
(Ⅲ)设g(x)=b(ex﹣x),若f(x)≤g(x)恒成立,求实数b的取值范围.