[问答题]
A turntable of radius , b x x.cywcwe1y(5pozd;5hb9215mgos2 2zbi7bb.x 3uwbg+xto m 3 wc$R_1$ 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, $\omega_1$ / $\omega_2$