28. 已知函数f(x)={11−x,x<0∣lnx∣,x>0(ef(x)=\left\{{\left.\begin{array}{l}{\frac{1}{1-x},x<0}\\ {\vert {lnx}\vert ,x>0}\end{array}\right.}\right.(ef(x)={1−x1,x<0∣lnx∣,x>0(e为自然对数的底数),则函数F(x)=f[f(x)]−1e3f(x)−1F(x)=f[{f(x)}]-\frac{1}{e^3}f(x)-1F(x)=f[f(x)]−e31f(x)−1的零点个数为((( )))