• 2022-06-29
    阿里云物联网平台设备属性设置,对应下面那个Topic:
    A: sys/productKey/DeviceName/thing/service/property/set
    B: sys/productKey/DeviceName/thing/service/property/set_reply
    C: sys/productKey/DeviceName/thing/event/property/post
    D: sys/productKey/DeviceName/thing/event/property/post_reply
  • A

    内容

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      下列有关基于开源MQTT接入阿里云平台方式说法错误的是________。( ) A: username由DeviceName和ProductKey组成。 B: password要通过哈希算法获得,且这个计算过程是不可逆的。 C: 阿里云平台仅支持不使用TLS加密的开源MQTT连接。 D: 心跳包的保活时间小于30秒或者大于1200秒,平台将拒绝连接。

    • 1

      下面CSS语法结构正确的选项有( )。 A: selector{property:value} B: selector{property:value;property:value} C: selector,selector{property:value} D: selector,selector{property:value;property:value}

    • 2

      绘制系统零极点分布图的Matlab命令为( )。 A: zpmap ( sys ) B: zpkmap ( sys ) C: pzmap ( sys ) D: pzkmap ( sys )

    • 3

      You are developing an application that will perform mathematical calculations.You need to ensure that the application is able to perform multiple calculations simultaneously. What should you do?() A: Set the IdealProcessor property of the ProcessThread object. B: Set the ProcessorAffinity property of the ProcessThread object. C: For each calculation, call the QueueUserWorkItem method of the ThreadPool class. D: Set the Process.GetCurrentProcess().BasePriority property to High.

    • 4

      在以下windows文件路径中()采用了相对路径。 A: win7\sys B: C:\win7\sys C: \win7\sys D: D:\win7\sys