Among the following communication technologies, the wired communication technology is

• A.RS485
• B.M-BUS
• C.3G/LTE
• D.ETH
• E.Zigbee
• F.PLC
• G.RF6LoWPAN

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What is the period unit of task scheduling ()?

• A.Tick
• B.second
• C.ms
• D.us

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The MQTT protocol adopts a request/response working mode, and the client subscribes to the server for information of interest

• A.True
• B.False

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In the Huawei IoT gateway Zigbee and 6LoVPAN technology, the network structure is as follows ()?

• A.Point to point
• B.Ring
• C.star
• D.MESH

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Among the following options, what is the advantage of the interrupt mechanism of HuaweiLiTeOS ()?

• A.When the peripheral does not require CPU intervention, the CPU can perform other tasks
• B.Peripherals need to wait for the end of the current task when they need the CPU
• C.Make the CPU spend a lot of time waiting and checking the status of the peripheral
• D.Decrease the system's buying time and execution efficiency

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