Вопрос № 606850 - Английский язык

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There are 1_______________ power amplifiers. These are similar to voltage amplifiers, except that their main 2__________________ is to supply a considerable amount of 3________________ i. e. voltage times current to the output or load 4________________, although the ac input signal may not draw any grid current and, hence, the input power may be zero.

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Now we shall discuss amplifier circuits, or more specifically, audio amplifiers. 1 _________ is an electron tube or transistor circuit, which 2_________________ up an ac signal applied to its input. It is called a voltage amplifier if the magnitude of the output  3  __________ . From the amplifier is considerably greater than that of the input voltage. As a matter of fact the ratio of the output voltage to the 4__________________ voltage is called the amplification or gain of the amplifier.

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MS-DOS is an operating system - a piece of software which looks after the running of your computer. It lets you create and keep track of files, run and link programs, and make use of peripheral devices (for example, printers and disk drives) attached to your computer.
Because your computer can run with one of several different operating systems (for example, MS-DOS, CP/M) the operating system is not built into the computer. Instead it is loaded from disk when the computer is started up.
Once the operating system has been loaded into the computer’s memory the disk from which it was loaded may be removed if required. The operating system needs to be reloaded only if part has been overwritten (when using very large programs, for example) or when the computer is restarted.
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Can your computer run with many different operating systems?

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When you first open your browser it will often connect to the Internet automatically, taking you right onto the Web. The web page that opens each time you connect is the browser's home page, the index page of your program's web site, so that you can get instant help and bulletins about updates to the software you are using.
You will notice that the browser creates a kind of frame around the web page you are viewing. The top part of the frame, which has drop-down menus and a toolbar, looks a bit like a word-processing program.

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The Internet originated in the early 1970s when the United States wanted to make sure that people could communicate after a nuclear war. This needed a free and independent communication network without a centre and it led to a network of computers that could send each other e-mail through cyberspace.

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1_________________________. Almost everybody has the Internet. 2_________________________. It can be very helpful to people who carefully choose websites that they visit.
3_________________________. There is much high-quality information that can help us understand many fields of study: science, medicine, the art and so on. 4_____________________________. Otherwise you would have to search for the necessary information in directories, libraries or on the phone for a long time.