[单选] 下列不属于现实层动画的条件的是（）

等待期条款 饲料缓冲度 You are developing a Windows Communication Foundation (WCF) service that is hosted by a Windows Forms Application.The ServiceHost instance is created in the Form Constructor.You need to ensure that the service is not blocked while the UI thread is busy. What should you do?（） Decorate the service implementation class with the following line of code [ServiceBehavior(UseSyncronizationContext = false)]。 Decorate the service implementation class with the following line of code [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]。 Call the Invoke method of the form and supply a delegate.。 Call the BeginInvoke method of the form and supply a delegate.。 You are developing an ASP.NET Web application. You create a master page. The master page requires a region where you can add page-specific content by using theASP.NET page designer. You need to add a control to the master page to define the region. Which control should you add？（） PlaceHolder。 ContentPlaceHolder。 Content。 Substituitio。 如果从国家投资主体的角度来看，企业所得税不能作为现金流出量来看待，只有从 企业投资主体的角度才将企业所得税列作现金流出量。 下列不属于现实层动画的条件的是（）