[问答题]
A turntable of radiumc-4;h st p-j:eeof k,l; e3qwsokmhqlu j*husw88r hjw0/:8 * $R_1$ 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, $\omega_1$ / $\omega_2$