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发生电气火灾时，应用哪类灭火器灭火？

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短程起钻10～15柱（水平井起到直井段），然后停泵观察，观察时间为：油气层井深H≤3000m的井，观察（）小时。

A. 1
B. 2
C. 4
D. 5

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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价值真空

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客人在商务楼层可直接办理入住、退宿手续。

A. 正确
B. 错误

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