JD。 The rescuer's maintenance is different from the official one. Because it is more convenient and faster to repair in JD.COM, you can pick up the parts at home and get a refund on the same day. However, if there is a problem with the official maintenance, you should apply for approval and inform you to send it back, and then repair or refund it after confirmation. Maintenance and repair means maintaining the function or performance of equipment through maintenance, and restoring the function or performance of equipment through repairing and replacing accessories. Equipment maintenance refers to the technical activities to restore the function of equipment after its technical state deteriorates or fails, including all kinds of planned repairs, unplanned fault repairs and accident repairs.