计算机应用英语论文范文

这个太难搞了！

In 1972, IBM introduced flexible diskettes as a medium for loading programs into mainframe computers. Because the disks were so flexible, they were nicknamed floppy disks. They are inexpensive, small, and easy to handle, store, and send through the mail. Most computers have at least one floppy disk drive. Floppy disks, also called diskettes, are available in two sizes: and inches. For MS-DOS based computers, the disks are available in 720-kilobyte (double - density), (high - density), and (extended - density) capacities. The disks have a density of 48 tracks per inch, whereas high-density disks have a density of 96 tracks per inch. Almost all floppy disks have a density of 135tracks per inch. The earliest models of floppy disks were single-sided. The addition of another read/write head in the disk drive led to the use of double-sided floppy disk, and doubled the capacity of the disk. Today, all floppy disks are double-sided. If you examine a floppy disk, you will see that a metal sleeve covers the read/write slot. When you insert the disk into a disk into a disk drive, the metal sleeve slides back, exposing the read/write slot. The read/write head of the floppy disk drive can position itself over specific tracks. Because of the metal sleeve and the rigid plastic casing, the floppy disk is less vulnerable to damage than the floppy disk. To use the files or programs that are on a floppy disk, you must first insert the disk into a floppy disk drive. Floppy disk drives are commonly referred to as the A drive and the B drive. Check your computer manual to see which drive is A and which is B.

cpu（电脑主机）what's the cpuPronounced as separate letters it is the abbreviation for central processing unit. The CPU is the brains of the computer. Sometimes referred to simply as the central processor, but more commonly called processor, the CPU is where most calculations take place. In terms of computing power, the CPU is the most important element of a computer large machines, CPUs require one or more printed circuit boards. On personal computers and small workstations, the CPU is housed in a single chip called a microprocessor. Since the 1970's the microprocessor class of CPUs has almost completely overtaken all other CPU CPU itself is an internal component of the computer. Modern CPUs are small and square and contain multiple metallic connectors or pins on the underside. The CPU is inserted directly into a CPU socket, pin side down, on the motherboard. Each motherboard will support only a specific type or range of CPU so you must check the motherboard manufacturer's specifications before attempting to replace or upgrade a CPU. Modern CPUs also have an attached heat sink and small fan that go directly on top of the CPU to help dissipate typical components of a CPU are the following:The arithmetic logic unit (ALU), which performs arithmetic and logical operations. The control unit (CU), which extracts instructions from memory and decodes and executes them, calling on the ALU when necessary. See "What Is CPU Overclocking?" in the "Did You Know...?" section of see All About Dual-Core Processors in the "Did You Know...?" section of understand how your computer system communicates with your CPU, see "Understanding PC Buses" in the Did You Know...?" section of Webopedia.