[问答题]
A turntable of radiuaf)uynb+ 3j*f j9,gm+t w3razsefsv*kqn+ h bx02.*f-ff )65mttwguh $R_1$ 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, $\omega_1$ / $\omega_2$