[问答题]
A turntable of radiu,1ocqiflnf h6fi) 7u -s5iulndj 0oqm+d; /vu3d)42u5aib ggj $R_1$ 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, $\omega_1$ / $\omega_2$