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简要说明气象色谱法的分离原理？

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William won the Battle of Hastings.Later,on（）,he was crowned king of England.

A. Easter Day
B. St.Andrew's Day
Christmas Day
D. Boxing Day

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在计算机的发展过程中，集成电路比晶体管先在计算机中使用。

A. 正确
B. 错误

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将下列各种橡胶的机械强度进行比较：NR、IR、CR、IIR、NBR、SBR、BR。

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You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application uses the background worker process (BWP). When the user clicks a button, the background worker executes a method named DoCalculations asynchronously. You need to implement a progress bar on the user interface (UI) that informs the user of the progress of DoCalculations. Which two actions should you perform?（）

A. Modify the Value property of the progress bar in DoCalculations.
B. Modify the Value property of the progress bar in the ProgressChanged event handler of the background worker.
C. Modify the Value property of the progress bar in the RunWorkerCompleted event handler of the background worker.
D. Call the ReportProgress method of the background worker in DoCalculations.
E. Call the ReportProgress method of the background worker in the DoWork event handler of the background worker.

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