358、Maintenance begins after the system is released.As people use i t, they will suggest minor improvements and enhancements.Occasionally, bugs slip through debug and testing, and removing them is another maintenance task.

264、The data link layer provides services to the network layer on the basis the services provided by the physical layer.

263、The abbreviation of File Transfer Protocol is .

262、The device used to store programs and data in a computer is .

261、The channel realizes the unified management of the peripheral equipment and the data transfer between the peripheral equipment and the main memory.

260、The bus is a common data channel for information between computer equipment and equipment, shared by all devices on the bus.

259、Disk array is a fast, large-capacity, and reliable external memory subsystem composed of multiple disk storages.

258、It is mainly of magnetic surface memory, optical disk memory and solid-state hard disk.

257、Registers can be into special registers and general registers.

256、CUP is the core of the hardware, for data processing, and can complete various arithmetic, logical operations and control functions.

255、single-user