[问答题]
A turntable of radiu;nlol4fd3f 5p2 k/gibk, o8lixo 6n3n -chbcwu)*hbye g*9b1s $R_1$ 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, $\omega_1$ / $\omega_2$