(NB-Nn)/(NA-Nn) = -(TA/TB)(NB-3)/(-2-3) = -(80/40)(NB-3)/-5 = -2NB = 10+3 =13
905.如圖所示之周轉輪系,A為80齒,B為40齒,旋臂C每分鐘順時針3轉(Nc..-阿摩線上測驗