Abstract: The present application provides a composite brake disc, the preparation method thereof and a friction stir tool. The composite brake disc comprises: an aluminum alloy base layer, and an aluminum matrix composite layer, where the aluminum alloy base layer and the aluminum matrix composite layer are bonded with each other through metallurgical bonding. A transition layer is formed at the boundary surface where the aluminum alloy base layer and the aluminum matrix composite layer are bonded with each other. A reinforced structure connecting the aluminum alloy base layer and the aluminum matrix composite layer is formed in the transition layer.

Abstract: A message processing method includes: a terminal sends first data to an external device to instruct the device to display a first interface in a full screen mode; the terminal sends a first instruction to the external device after the terminal receives a new message of a first application, to instruct the external device to display first notification information; and when the terminal receives a first input operation performed by a user on the first notification information, displays a third interface, and sends second data to the external device, to instruct the external device to divide a display area into a first display area and a second display area. In this way, the external device can simultaneously display a plurality of independent display interfaces in split-screen modes, so that the user can simultaneously operate the plurality of display interfaces.

Abstract: Embodiments of this application disclose a terminal screen projection control method and a terminal, to improve application processing efficiency in a scenario in which a terminal is connected to a large screen. The embodiments of this application provide a terminal screen projection control method. The method is applied to a terminal. The terminal is connected to a display device. The method includes: The terminal collects first voice data; the terminal performs voice recognition processing on the first voice data; and the terminal controls, based on a result of the voice recognition processing, the display device to display content associated with the first voice data.

Abstract: An audio playing method includes obtaining, by an electronic device, to-be-played audio after the electronic device establishes a coupling to an external audio device, playing, by the electronic device, the to-be-played audio when the to-be-played audio is associated with the electronic device, and sending, by the electronic device, the to-be-played audio to the external audio device over the coupling when the to-be-played audio is associated with the external audio device.

Abstract: The present invention discloses a system and a method for identifying data, which relates to the field of data transmission. The system comprises a transmitting end and a receiving end, the receiving end comprises a data receiving unit, a first field determining unit, a second field determining unit, identification unit, the method comprises: receiving a PDU with the first one and the second one of length indication fields transmitted by the transmitting end; analyzing and determining whether the value of the second one of length indication fields is equal to a first preset value; if the above two judgments are success, then the corresponding PDU data pack would be identified as valid. The positive effects of the above technical schemes are: remedying the defect of the protocol in that the descriptions of the PDU package with the upstream construction and the PDU package with the downstream reconstruction are inconsistent.

Abstract: The present invention discloses a system and a method for identifying data, which relates to the field of data transmission. The system comprises a transmitting end and a receiving end, the receiving end comprises a data receiving unit, a first field determining unit, a second field determining unit, identification unit, the method comprises: receiving a PDU with the first one and the second one of length indication fields transmitted by the transmitting end; analyzing and determining whether the value of the second one of length indication fields is equal to a first preset value; if the above two judgments are success, then the corresponding PDU data pack would be identified as valid. The positive effects of the above technical schemes are: remedying the defect of the protocol in that the descriptions of the PDU package with the upstream construction and the PDU package with the downstream reconstruction are inconsistent.