说明：  实现手动开机3066功能，例如：手动按住开机键2s—8s范围内正常开启3066主板（注，手动按住超过8s会关机）。
(Manual boot 3066 functions, such as: manual press and hold the power button 2 s to 8 s within the scope of normal open 3066 motherboard (note, manual and hold more than 8 s will be turned off).)