[问答题]
A turntable of radiusb71srlbr5 xh s t/0f+r(mwpl qt0.:j 1 f t a0cnq0ms9;em*lio$R_1$ 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, $\omega_1$ / $\omega_2$