[问答题]
A turntable of radiu7e vr6yxr -;or5z9p*igdjeem 7zhi fe2 u(h:)si 60 lx,twoh8e $R_1$ 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, $\omega_1$ / $\omega_2$