Among the following options, the advantages of the Huawei LiteOS operating system kernel are

API application scenarios are divided into two kinds, some manufacturers only do sensors, there are a variety of sensors, there are cars, there are also families and Camera, which is what we call horizontal ecology.

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 ()

The positioning in the refinery can be completed by the positioning of the base station.

Which of the following factors and technologies make NB-Iot connection characteristics?