Прочитайте текст. A PC main memory is fast storage that is directly accessible by the CPU and is use...: ответ на тест 1072168 - Английский язык

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A PC main memory is fast storage that is directly accessible by the CPU, and is used to store the currently executing programme and immediately needed data. PCs use semiconductor random access memory (RAM) of various kinds such as DRAM or SRAM as their primary storage. The main memory is much faster than mass storage devices like hard disks or optical discs, but it is usually volatile, it does not retain its contents (instructions or data) in the absence of power.
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What is the disadvantage of main memory?

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What is ROM?
Memory is the system of component of the computer in which information is stored. There are two types of computer memory: RAM and ROM.
RAM (random access memory) is the volatile computer memory, used for creating, loading, and running programs and for manipulating and temporarily storing data;
ROM (read only memory) is nonvolatile, nonmodifiable computer memory, used to hold programmed instructions to the system.
The more memory you have in your computer, the more operations you can perform.

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A visual display unit is a piece of electrical equipment, usually separate from the computer case, which displays viewable images generated by a computer without producing a permanent record. The word “monitor” is used in other contexts; in particular in television broadcasting, where a television picture is displayed to a high standard. A computer display device is usually either a cathode ray tube or some forms of flat panel such as TFT LCD.
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What is a computer display device?

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In computers, the keyboard is an arrangement of buttons that each corresponds to a function, a letter or a number. They are the primary devices of inputting text. In most cases, the keyboards contain an array of keys specifically organized with the corresponding letters, numbers, and functions printed or engraved on the button. They are generally designed around an operator’s language, and many different versions for different languages exist. In English, the most common layout is the QWERTY layout, which was originally used in typewriters.
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What is the keyboard?

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A mouse is a small, slidable device that users hold and slide around to point at, click, and sometimes drag objects on the screen in a graphical user interface using a pointer on the screen. Almost all personal computers have a mouse. A mouse can be plugged into a computer rear mouse socket, or as USB (device), or, more recently, may be connected wirelessly via USB antenna or Bluetooth antenna.
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What is a mouse used for?

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Prior to the wide spread of PCs the computer that could fit on a desk was considered remarkably small. Today the phrase usually indicates a particular style of the computer case. Desktop computers come in a variety of styles ranging from large vertical tower cases to small form factor models that can be tucked behind LCD monitor. In this sense, the term “desktop” refers specifically to a horizontally-oriented case, usually intended to have the display screen placed on top to save space on the desk top. Most modern desktop computers have separate screens and keyboards.