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Выпишите из приведённого ниже перечня формул в два столбика формулы оксидов металлов и оксидов неметаллов и дайте им название: Na2O, N2O5, NaOH, HNO3, CuO, SO2, SCl2, Cl2o7, FeS, Fe2O3, CuF2, P2O5.
Ответы 1
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Оксиды металлов:
Na2O - оксид натрия
CuO - оксид меди(II)
Fe2O3 - оксид железа(III)
Оксиды неметаллов:
N2O5 - оксид азота(V)
SO2 - оксид серы(IV)
Cl2O7 - оксид хлора(VII)
P2O5 - оксид фосфора(V)
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Автор:
mileytpm4 - 6 лет назад
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Data and instructions must enter the data processing system, and information must leave it. These operations are performed by input and output (I/O) units that link the computer to its external environment.
The I/O environment may be human-related or human-independent. A remote banking terminal is an example of a human- related input environment, and printer is an example of a device that produces output in a human-readable format. An example of a human-independent input environment is a device that measures traffic flow. A reel of magnetic tape upon which the collected data are stored in binary format is an example of a human-independent output.
Input-Output Interfaces, Data enter input units in forms that depend upon the particular device used. For example, data are entered from a keyboard in a manner similar to typing, and this differs from the way that data are entered by a bar-code scanner. However, regardless of the forms in which they receive their inputs, all input devices must provide a computer with data that are transformed into the binary codes that the primary memory of the computer is designed to accept. This transformation is accomplished by units called I/O interfaces. Input interfaces are designed to match the unique physical or electrical characteristics of input devices to the requirements of the computer system. Similarly, when output is available, output interfaces must be designed to reverse the process and to adapt the output to the external environment. These I/O interfaces are also called channels or input-output processors*(IOP).
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High-speed devices: magnetic disk; magnetic tape.
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Low-speed devices: bar-code readers; character printers; digitizers; keyboard input devices; plotters; voice recognition and response units
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1. What is the purpose of input and output devices?
2. What types of input-output devices do you know?
3. Why are data transformed into a binary code while entering the input device?
4. Give an example of a human independent output.
5. What is an I/O interface?
6. What are the major differences between the various I/O devices?
7. What types of I/O devices tend to be high-speed devices?
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