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传统的监控：将所有的被监控设备和应用列举出来，分门别类；面向业务的监控：将所有的监控对象按照（）组织起来。

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A Windows Communication Foundation (WCF) application uses a data contract that has several data members. You need the application to throw a SerializationException if any of the data members are not present when a serialized instance of the data contract is deserialized.What should you do?（）

Add the KnownType attribute to the data contract. Set a default value in each of the data member declarations.
B. Add the KnownType attribute to the data contract. Set the Order property of each data member to unique integer value.
C. Set the EmitDefaultValue property of each data member to false.
D. Set the lsRequired property of each data member to true.

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超声波频率越高，近场区也就越长。

A. 正确
B. 错误

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带内网管指通过（）进行管理。

A. 上联的业务通道
B. EC4G前面板的网口
C. EC4G前面板的CONsOLe口

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下列（）属于严重违章指挥行为。

A. 无规程、措施布置安排生产
B. 现场存在的事故隐患未处理，强令工人作业
C. 强令员工冒险违章作业，特殊作业未安排专人进行现场安全监护
D. 安全设施不齐备，强令工人作业
E. 特殊工种未经培训上岗

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