[问答题]
A turntable of radiu,+6pt2qil ug+bxs3m pp0ps3 (fm8e v ndb-mcbum t ,4mz -f;9ds $R_1$ 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, $\omega_1$ / $\omega_2$