单项选择题
GIF files are limited to a maximum of 8 bits/pixel，it simply means that no more than 256 colors are allowed in（）.
A．an image B．a file C．a window D．a page
单项选择题 若某二叉树的先序遍历序列和中序遍历序列分别为PBECD、BEPCD，则该二叉树的后序遍历序列为（）。
单项选择题 integration（）is the process of verifying that the components of a system work together as described in the program design and system design specifications.
单项选择题 The maximum number of data that can be expressed by 8 bits is（）.
