[问答题]
A turntable of radiusk8()k1xa1 7xwiiu y gu vt.z.f) 2; yovm:i ht ::eqnm3d;wydi$R_1$ 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, $\omega_1$ / $\omega_2$
