When using SofRadio to initiate a binding request to the platform, if a requesttimeout error is displayed, the possible reasons are ()? (multiple choice)

AR5O2EGRc-Lc The command to view the online status of all devices is ()?

eMTC can be applied to the Internet of Vehicles and video surveillance scenarios

Among the following options, what is not the technical feature of NB-JoT?

OBD uploads the data to the Internet of Vehicles cloud service platform through the mobile network, and provides the account number of the iot application server. The password is generated in ()