????:1?????:?????????

2????????

3???????

4????????????

5??????????

??????,12???3???????????????10????58?????????,??C919???????MU5421“????????????????”???,???159?????

??????C919???????,?????????????????????????????,?C919??7????????????

???,???B-657T???C919???????C919????,?WiFi?,??,??,??“??????,????????Wi-Fi??????????????”??(?????? ???????????????????? ?? ?)

??:????