决策方案的抉择，取决于（）。A．专家的多数意见B．方案制定的数学模型C．决策者的决断D．专家意见和领导

A、mumble and avoid direct eye contacts with the audience

B、speak quickly so as to finish the presentation efficiently

C、keep your pitch and speed of your presentation

D、give the audience amiable facial expressions

A、Make no direct or indirect reference to people like you, they, we, etc.

B、Use simple present tense.

C、Use time order phrases.

D、Be flexible in using active and passive voice.

A、A presentation use visual aids to show some information to the audience.

B、A presentation involves explaining your ideas.

C、When you explain something, the presenter should not talk about the backstory about the topic.

D、When presenting ideas, the presenter need to use formal and academic language.

A、Get familiar with the content.

B、Write everything you 'd like to talk about on the PowerPoint slides.

C、Think about what your audience have already known.

D、Use small cards for help.

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You add a TreeView control to show the hierarchical structure of orders and order details.Each order contains an ObservableCollection named OrderDetails.You write the following code fragment. (Line numbers are included for reference only.)You need to ensure that the TreeView control meets the following requirements:Each order is shown as a TreeView node.The order nodes have order detail nodes as children.The order detail nodes have no children.Which code fragment should you insert at line 07？（）

A.

B.

C.

D.

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.The application uses the drag-and-drop functionality.You need to ensure that the drag-and-drop operation is stopped when a user moves the cursor outside the boundaries of the application form.Which enumeration member should you use？（）

A.DragAction.Cancel

B.DragAction.Drop

C.DragDropEffects.None

D.DragDropEffects.All