[问答题]
A turntable of radiust/ (fspg.n ya+wr4au:h4 us h1 y y7;8as; mk: k/jzxn-0cmrty$R_1$ 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, $\omega_1$ / $\omega_2$