[问答题]
A turntable of radiuq .(bd,i il7m 0u)gl*crksfi6 qf edo888 u+v5y-fkgh07bbz ns $R_1$ 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, $\omega_1$ / $\omega_2$