[问答题]
A turntable of radius9jq9jokpp (r:e8p z 2utr8 zv h2c12ft+tztoz*ah-*my95wq z $R_1$ 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, $\omega_1$ / $\omega_2$