Прочитайте текст. Iodine a steel-gray solid readily vaporizes when heated. The vapor is violet in co...: ответ на тест 857123 - Английский язык

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Iodine, a steel-gray solid, readily vaporizes when heated. The vapor is violet in colour. If the vapor is allowed to cool, it passes directly back into the solid state. This process of passing from the solid state to the vapor state and then back to the solid state without the formation of a liquid is called sublimation. If a saturated solution of potassium nitrate is heated and then allowed to cool, crystals of the substance form on the bottom of the vessel. These are formed by precipitation, which takes place during the cooling process.
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Iodine readily vaporizes …

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A solution forms when one substance (usually solid) dissolves in another (usually a liquid). The solid breaks up into tiny particles and spreads throughout the liquid. 1_______. Solutions are always clear. 2_______. Solid particles spread throughout the liquid. 3_______. If you leave a suspension to stand, most of the solid particles will eventually sink. 4_______.

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The television receiver includes tube circuits for receiving, amplifying, and synchronizing the signals, and a large cathod tube called a kinescope. This part of the device converts the video impulses from the transmitting station into luminous spots on a fluorescent screen. In the kinescope the amplified video signals are applied to the grid, and through it control the intensity of the electron beam.

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In the colour receiver the incoming signal goes through frequency and amplitude selective circuits. In these circuits the brightness components, the colour components, and the horizontal and vertical beam-synchronizing components are separated. The brightness component is applied simultaneously to each of the three electron guns. The red, green, and blue colour signal voltage components are produced and are applied to the three respective kinescope electron guns. They combine with the brightness components voltage to produce beam intensities which reproduce the original picture.

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Telephony is the branch of telecommunication which provides for the exchange of information in the form of speech. In any telephone system speech or other sounds are converted into electric signals that are transmitted to a distant point where they are converted back into reproductions of the original sound.
Telephone set is an assembly of apparatus provided at each end of a telephone circuits to enable the user to make and receive calls.
A microphone forming part of a telephone set is called a telephone transmitter while a transducer forming part of a telephone set and used to convert voice-frequency currents into audible sounds is telephone receiver. The system also includes an electric bell responsive to low-frequency AC or pulsating current and is used as a calling device at a telephone station.

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In overseas communications, telegraph messages are transmitted over high-frequency radio (3-30 MHz), transoceanic submarine cables, or satellite communication channels. But it should be noted that the number of messages carried on high-frequency radio is constantly decreasing.
Most radio circuits operate directly between different countries of the world. As to radio telegraph transmitters, they are usually either of the frequency-shift-keying type or the single-side-band type.