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在管理工作中要注意哪些？

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如何通过看钎子判断出铜终点？

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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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