单项选择题 ASCII is a 7-bit code used to represent numeric, alphabetic, and special printable characters. It also includes codes for control characters, which are （）.

单项选择题 In most wide area networks, the communication subnet consists of two distinct components：transmission lines and （）.

单项选择题 在下列各种类型的I/O技术中，对CPU依赖最小的是（）。

单项选择题 网络环境中实现分布式进程通信必须解决哪3个主要的问题？（） Ⅰ.进程命名与寻址方法 Ⅱ.多重协议的识别 Ⅲ.协议转换 Ⅳ.进程间相互作用的模式

单项选择题 TCP(Transmission Control Protocol) was specifically designed to provide a reliable end-to-end byte stream over a(n) （）.