题目内容

人体运动的速度方向与加速度方向始终相同。

A. 正确
B. 错误

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更多问题

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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人体运动的速度方向与加速度方向始终相同。

A. 正确 B. 错误

为什么将放大器分为前置放大器和主放大器。

为什么要制定《中华人民共和国动物防疫法》？

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（）。

A. 正确
B. 错误