[问答题]
A turntable of radiux+,8z2h g 2yp,z gp vx4cw.yibs 7 -hq8;a/lza lidw4fig.) qrn$R_1$ 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, $\omega_1$ / $\omega_2$