Why is the throttle of the Great Wall C30 different for the same model? (Abnormal throttle sound)

The throttle of the new car sounded abnormal after 200 kilometers, and it didn't ring until it was replaced. The original throttle was also changed! The final answer is that this is the sound of normal throttle operation! ? 0? 2? 0? 2? 0? Later, I auditioned several cars of the same model, all of which used Bosch throttle, but some of them were louder and some were lower, but there was no sound with Siemens throttle! Vehicle motherboard system is Siemens' hope, and Great Wall Company gives users a reasonable explanation.