题目内容

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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根据《UCP600》的规定，如果信用证中没有规定是否可以分批装运与转运，应理解为不允许分批装运与转运。

A. 正确
B. 错误

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空冷风机的维护检查：振动是否超标，声音是否异常，轴承润滑是否良好，皮带松紧合适，叶片角度有无变动，叶片与风筒的间隙有无变动。

A. 正确
B. 错误

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甲状腺癌最多的病理类型是（）。

A. 未分化癌
B. 滤泡状癌
C. 髓样癌
D. 乳头状癌
E. 髓样癌和滤泡状癌的混合癌

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