[问答题]
A turntable of radiup5( cx69 wv-jny.ge sx5h e uff+n+ u;9 3.yqu8;om vuezw e8bxtkd,a4s $R_1$ 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, $\omega_1$ / $\omega_2$