[问答题]
A turntable of radiusjm2,sfu 07 y9gxgg.n zcr ,z(pen22n8 idvb sb ig.b8rn65u8d $R_1$ 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, $\omega_1$ / $\omega_2$