A:﹣6
B:﹣2
C:2
D:6
某变速箱中有甲、乙、丙三个齿轮,如图所示,其半径分别为r1、r2、r3,若甲轮匀速转动的角速度为ω,三个轮相互不打滑,则丙轮边缘上各点的向心加速度大小为( )
—Jenny cut her finger(手指)cooking dinner. What should she do?
—She should _________.