投影仪和平板哪个伤眼睛

简介：Jia Ding was a general's personal belongings, and the expenses were initially borne by the generals themselves. However, with the popularity of the Jia Ding system, especially after the Liaodong Incident, the imperial court recognized the existence of Jia Ding and changed it to officials to provide food and salary. At this stage, the military field guard system existed in name only in various places.