[问答题]
A turntable of radiusdh. e zup+60, 5hu*bt/yrgbypbs0gj6 xp c04t2 azpq hxx,)6r $R_1$ 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, $\omega_1$ / $\omega_2$