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进入辐照装置、工业探伤、放射治疗等强辐射工作场所时，除佩戴常规个人剂量计外，还应当携带（）。

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You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.Dim ar As IAsyncResult = cmd.BeginExecuteReader()You need to execute a method named DoWork() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A. While ar.AsyncWaitHandle Is Nothing DoWork()End Whiledr = cmd.EndExecuteReader(ar)
B. While Not ar.IsCompleted DoWork()End Whiledr = cmd.EndExecuteReader(ar)
C. While T hread.CurrentThread.ThreadState = ThreadState.Running DoWork()End Whiledr = cmd.EndExecuteReader(ar)
D. While Not ar.AsyncWaitHandle.WaitOne() DoWork()End Whiledr = cmd.EndExecuteReader(ar)

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烫料

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文档管理包括（）.

A. 目录管理
B. 隐性知识管理
C. 知识分类和模块化机制
D. 知识地图和搜索机制
E. 内部文档的积累和更新机制

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允许进行二次保留的故障类别为（）.

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