Relationship between throttle opening and gear position

The opening and closing of the throttle is related to the amount of fuel injected into the engine, that is, when you start the engine, the throttle will open, but it will not open very much. Of course, when stepping on the gas pedal, the gas pedal will open halfway, and when stepping on 3/4, the gas pedal will open completely, which has nothing to do with the gear position. .