[问答题]
A turntable of radius eclrkb/n1h:lt f cek:(y78o)q(qfutjq 3k6au xi badqs,5.h )s .qqf(1-,sk$R_1$ 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, $\omega_1$ / $\omega_2$