[单选] 在Photoshop中的图层蒙版相当于（）

You have an Exchange Server 2010 organization named contoso.com.  Your company plans to provide business continuity services for a company named Fabrikam. Fabrikam has an Exchange Server 2007 organization and uses the fabrikam.com SMTP domain. You need to configure your organization to queue and relay all e-mail messages sent to fabrikam.comfrom the Internet.  What should you do？（） Create a new remote domain， and then modify the mail exchange （MX） record for the fabrikam.compublic DNS domain.。 Create a new remote domain， and then modify the mail exchange （MX） records for the contoso.compublic DNS domain.。 Create a new External Relay Accepted Domain， and then modify the mail exchange （MX） records for the contoso.com public DNS domain.。 Create a new External Relay Accepted Domain， and then modify the mail exchange （MX） records for the fabrikam.com public DNS domain.。 乏情 在Photoshop中可以还原多步操作的面板是（） 历史记录面板。 动作面板。 路径面板。 图层面板。 You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a Button control for the application. You need to ensure that the application meets the following requirements: When the mouse pointer is over the Button control, the background color of the button is set to red and the Button control appears bigger. When the mouse pointer is not over the Button control, the button returns to its original state. What should you do?（） Create a template. Declare a VisualState element in the template.。 Create a StoryBoard animation. Add an EventTrigger class to the Button control that begins the StoryBoard animation.。 Create a ScaleTransform class. Bind the ScaleX and ScaleY properties of the Button control to the Background property by using a custom value converter.。 Add a method named ChangeAppearance in the code-behind file. Subscribe the ChangeAppearance method to the MouseEnter event of the Button control.。 蒙版文件是一个（）文件。 灰度。 RGB。 二色。 以上说法均不正确。 在Photoshop中的图层蒙版相当于（）