[问答题]
A turntable of radiuoc ,s31 c3gv(mbmy:oy8poz*c dd (lp4f-1bx91wn us+ud 9iao wf e/p.s $R_1$ 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, $\omega_1$ / $\omega_2$