[问答题]
A turntable of radiubm pwq;wypg), ra3a 78s 1)zvrra5uf0so.azv 03 c7u4pkps z2d $R_1$ 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, $\omega_1$ / $\omega_2$