[问答题]
A turntable of radiu-z8. rhrh/r/ cc+ubd,2w-6 t yhyymrfg 8k3k/-vmz7*xrh vhr s $R_1$ is turned by a circular rubber roller of radius $R_2$ in contact with it at their outer edges. What is the ratio of their angular velocities, $\omega_1$ / $\omega_2$