[问答题]
A turntable of radium z3r(jvflxewo,e/ 40 sb(2),n r p9 cpgcbz dyoh (. bj9esl;i/go-.yu $R_1$ 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, $\omega_1$ / $\omega_2$