无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

單項(xiàng)選擇題

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
The application contains a set of Button controls. 
You need to ensure that a button is highlighted when the mouse pointer is located over a button that contains no content. 
Which code fragment should you use?()

A.
B.
C.
D.

題目列表

你可能感興趣的試題

微信掃碼免費(fèi)搜題