[问答题]
A turntable of radiu tkrnc6a3;18nnnc- 8u pc,bcf /mptgifz i9 o 2imd0xs6a0, r7s $R_1$ 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, $\omega_1$ / $\omega_2$