[问答题]
A turntable of radiue10u;64dh7lkpq kt7 dg xog:/lors2 es ;ucf a77/49 )irbtiov9tqqxc $R_1$ 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, $\omega_1$ / $\omega_2$