2. Given the radius of the base of a cylinder is $r$, the height is $h$, the volume is 2, and the surface area is 24. Then $\frac{1}{r}+\frac{1}{h}=(\quad)$.
(A) 6
(B) 8
(C) 12
(D) 24
2. A. From the conditions, we know $\pi r^{2} h=2, 2 \pi r^{2}+2 \pi r h=24$. Dividing the two equations gives $\frac{1}{r}+\frac{1}{h}=6$.