The five basic components of computer hardware system are input device, arithmetic unit, controller, memory and output device.
The hardware consists of five parts: arithmetic unit, controller, memory, input device and output device.
In which: central processing unit (CPU)= for short) = arithmetic unit+controller; Host = CPU+ main memory.
Software refers to various programs and data. Computer software includes system software needed by the computer itself and application software needed by users to complete tasks.
First, the development trend of computers
Giant: The operation speed is faster, the storage capacity is larger, the function is more perfect, and the reliability is stronger.
Miniaturization: from desktop to notebook computer, PDA and notebook computer, the price is low, the use is convenient and the software is rich.
Networking: Using modern communication technology and computer technology, computers distributed in different places are interconnected, and they communicate with each other according to network protocols, thus sharing software, hardware and data resources.
Intelligence: the ability of a computer to simulate human feelings and thinking processes.
Second, the main technical indicators of microcomputer
Clock frequency: refers to the clock frequency of the CPU, which determines the speed of the computer to a certain extent, in GHZ.
R operation speed: MIPS millions of times per second, which refers to the number of addition instructions that can be executed per second.
Storage capacity: internal storage, external storage.
Word length: refers to the number of binary data bits that can be processed simultaneously by computer operation components at one time; Access cycle: refers to the time required for CPU to access data from memory.
Third, what is an operating system and its main management functions.
A kind of system software between hardware and application software, which runs directly on bare metal, is the first extension of computer hardware system, and is responsible for managing all kinds of software and hardware resources in the computer, controlling the operation of all kinds of software, and is the bridge processor management between people and computers. Processor management, file management, job management, storage management, equipment management.
4. What is a computer network?
Computer network is a system that aims at sharing software, hardware and data resources, physically connects computers with independent operating systems distributed in different places, and communicates with each other according to network protocols.
Verb (abbreviation of verb) briefly describes the relationship among files, workbooks, payrolls and cells in Excel.
Workbook is an Excel file. A workbook consists of several worksheets. A worksheet consists of multiple cells.
6. What are the five ways to align WORD documents? What is the default alignment?
Five alignment methods: left alignment, both ends alignment, center alignment, right alignment and scattered alignment.
Default Alignment: "Left Alignment".
Seven, provide indentation marks on the horizontal ruler of the WORD window. Try to write four indentation ways that it can achieve.
Left indent, right indent, first indent, hanging indent.
Eight, what is the basic composition of computer hardware? Try to describe the main functions of each component.
(1) The hardware system consists of arithmetic unit, controller, memory (internal memory and external memory), input device and output device.
(2) Main functions: arithmetic unit: a component for calculating and processing digital information, arithmetic logic operation, and ALU (Arithmetic Logic Unit).