A．关键码个数最少的二叉搜索树B．搜索时平均比较次数最少的二叉搜索树C．所有结点的左子树都为空的二叉搜索树D．……

单项选择题假设某个信道的最高码元传输速率为2000Baud，而且每一个码元携带5bit的信息，则该信道的最高信息传输速率为(7)。

单项选择题A ______ copies a photograph, drawing or page of text into the computer.

单项选择题One use of networks is to let several computers share ______ such as file systems, printers, and tape drives.

单项选择题C++ is used with proper______design techniques.

单项选择题As they access the corporate network, mobile and remote users inadvertently can infect the network with(72)and worms acquired from unprotected public networks。