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我国一企业向日本一进口商出售某商品发盘，其中付款条件为即期付款交单(D/P at sight)，对方答复可以接受，但付款须按以下条件：“付款交单见票后90天”(D/P at 90 days aftersight)并通过A银行代收。按一般情况，货物从我国运至日本最长不超过10天。试分析该进口商为什么提出此项条件？
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You need to ensure that users can view content in a book-reading format that displays two pages at a time.Which control should you use？（）
A.FlowDocument
B.FlowDocumentReader
C.FlowDocumentPageViewer
D.FlowDocumentScrollViewer
We have only one vacancy, but so far have received more than 30 () for the job.
A、applications
B、applicants
C、applicators
D、appliances
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You write the following code fragment.You need to implement the MyProject.MyConverter class.What should you do？（）
A.Implement the IValueConverter interface.
B.Implement the IMultiValueConverter interface.
C.Inherit from the TypeConverter class.
D.Apply the TypeConverterAttribute attribute.
More sophisticated robots with intelligence are made possible by______.
A．the broader application of robotics
B．the availability of robots across the world
C．the technological progress in the field
D．the ever decreasing cost of computing power
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You write the following code fragment. (Line numbers are included for reference only.)You need to ensure that a video file begins to play only when a user clicks Play.Which code fragment should you insert at line 06？（）
A.
B.
C.
D.
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You write the following code segment.The TextBox control is data-bound to an instance of the Contact class. You plan to implement an ErrorTemplate in the TextBox control.You need to ensure that the validation error message is displayed next to the TextBox control. Which code fragment should you use？（）
A.
B.
C.
D.
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You create a custom control named Wheel.You need to ensure that the Speed property of Wheel can be animated.What should you do？（）
A.Inherit the DependencyObject class.
B.Declare the Speed property as a dependency property.
C.Declare an animation of the Speed property from within the code-behind file.
D.Implement the System.Windows.Media.Animation.IAnimatable interface with the Wheel class.
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