[问答题]
A turntable of radiu 63gqih uh(x wf tfd)fffw-z bl240y;;s a/nt ztb4 jc:xd5u.4l$R_1$ 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, $\omega_1$ / $\omega_2$