[单选]
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You create a game where a ball drops from the top to the bottom of a window.
You plan to create a single animation for the game.
You need to ensure that the animation shows the ball bounce.
What should you do?（）

A . Use the KeySpline property of a SplineDoubleKeyFrame object.
B . Use the EasingFunction property of an EasingDoubleKeyFrame object.
C . Use the DecelerationRatio and AutoReverse properties of a StoryBoard object.
D . Use the DecelerationRatio and AccelerationRatio properties of a StoryBoard object.

舌苔在Access中，数据导入是将其它格式文件中的数据和其它Access数据库中的对象导入到（）中，而数据导出是将Access数据库中的（）传送到另一个数据库或其它格式文件中。苛勒顿悟说的两个基本观点是什么？转移定价准确地说，计算机的中央处理器（CPU）是由（）组成。 ①运算器 ②控制器 ③主存 ④寄存器 ①②。 ①②③。 ①②④。 ①②③④。

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You create a game where a ball drops from the top to the bottom of a window.
You plan to create a single animation for the game.
You need to ensure that the animation shows the ball bounce.
What should you do?（）

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