[问答题]
A turntable of radiu jnns+mn(be+ed(h 7t6yrikc8/+xge23 jkvv0u 4 4hi; o2sotv*j u-xts $R_1$ 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, $\omega_1$ / $\omega_2$