[问答题]
A turntable of radiuq 5sa/svcq, ta23zmg4-e9:7dl/smbe ve8pp(u7 nr zwy) dq-l 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, $\omega_1$ / $\omega_2$