[VIP第8年] 指数:7
通过认证 
| 1. Change the transmission ratio BAI to expand the variation range of du torque and speed of the driving wheel. |
| 2, in the engine rotation direction is unchanged, so that the car can go backwards. |
| 3, the use of neutral, interrupt power transmission, to the engine can start, speed, and facilitate the transmission shift or power output. |
