Typically, 60-tooth, 16 - pitch gears provide the optimum characteristics for RPM measurement, but other gear types can serve special application needs.
I unloaded my gear and made my way in pitch blackness to the starting area.
我卸下我的消毒设备，并在距我的方式黑暗的起步区。
3
Some cars have variable-ratio steering, which uses a rack-and-pinion gear set that has a different tooth pitch (number of teeth per inch) in the center than it has on the outside.