[问答题]
A turntable of radiu wvsvelqa)6t 0 13ov0r1tl+l)ds i (xtp: (qrp6fgojtr qn+: :s $R_1$ 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, $\omega_1$ / $\omega_2$