359、The chief disadvantage of a low — altitude orbit lies in the rate at which a satellite must travel.Because their period of rotation is fas/er than the rotation of the earth, satellite in lower orbits do not stay above a single point on the earth ＇ s surface.Instead, an observer, who stands on the earth looking upward through a telescope, sees such satellite move across the sky.In fact, a single satellite can complete an entire orbit in approximately 1.5 hours.

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

254、operation code