[单选]
You are creating a custom control. The UI of the control must contain several text boxes and two buttons. The control must be available in the global assembly cache for reuse across multiple Web applications. You need to achieve this functionality by using the minimum amount of code.
What should you do? （）

A . Create a control that derives from System.Web.UI.Control.
B . Create a control that derives from System.Web.UI.WebControls.CompositeControl.
C . Create a control that derives from System.Web.UI.WebControls.WebControl.
D . Create a control that derives from System.Web.UI.UserControl.

将175转换成十六进制，结果为（）。 AFH。 10FH。 D0H。 98H。当身上的衣服烧着后，以下灭火方法中，做法正确的是（）。快速奔跑呼救。就地打滚，压灭火焰。用手扑打火焰。直接分销渠道与间接分销渠道各自的优缺点是什么？下列哪些方法可以将一幅彩色图像转变为灰度效果？（并不要求一定是灰度颜色模式）（）应用“图像－模式－灰度”命令。应用“图像－调整－去色” 命令。应用“图像－调整－阈值” 命令。应用“图像－调整－色相/饱和度”命令，将饱和度调至最低。 B分段盐析

You are creating a custom control. The UI of the control must contain several text boxes and two buttons. The control must be available in the global assembly cache for reuse across multiple Web applications. You need to achieve this functionality by using the minimum amount of code.
What should you do? （）

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