案例分析题When you open a file or run a program in a computer, a window appears on the desktop of your computer. The () of the window indicates which program you are currently working in arid its color will become blue if a window is active. When you click on The () , the window disappears and appears as a button on the taskbar. Clicking on a button in () will invoke a specific command. When you click on The () , the window disappears and appears as a button on the taskbar.
A. maximize button
B. restore button
C. close button
D. minimize button
The purpose of the (73) is to provide fully integrated analog services to users.
A. ISDN
B. WWW
C. FTP
D. HTTP
下列各种外设中,常用的多媒体输入设备是 (53) 。
A. 显示器
B. 扫描仪
C. 打印机
D. 键盘
下面关于二叉树的叙述正确的是 (40) 。
A. 一棵二叉树中叶子结点的个数等于度为2的结点个数加1
B. 一棵二叉树中的结点个数大于0
C. 二叉树中任何一个结点要么是叶,要么恰有两个子女
D. 二叉树中,任何一个结点的左子树和右子树上的结点个数一定相等