[问答题]
A turntable of radiu:jbj mx.8psf*xf,njm6k- u w 28 q 8b)6q4dsrkgj:(vucui3nts $R_1$ 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, $\omega_1$ / $\omega_2$