COMMUNICATIONS SERVICES.
1.Telephones connected by a network of cables, are commonly used for the two-way transmission of speech. The signals are switched from one line to another at switched centers known as telephone exchanges. Lines in a small area are switched by local exchanges, local exchanges are connected through trunk exchanges, and trunk exchanges are connected to other countries by international exchanges. Such a system is called a public Switching Telephone Network.
2. Modern digital telephone networks can use videophones to transmit video images as well as*9.1.2. speech. The telephone network is used by
video-conferencing services to interconnect small television studios. In this way, business people can hold conferences at a distance.
3. Public telephone networks are used by many other data communications services. One of the oldest* 3.1. is the telex system. This enables* 5.6.3.2.messages, typed on teletype terminals, to be automatically printed by distant teleprinters. Telex can only transmit simple text containing capital letters and punctuation marks.
4. A newer, more advanced telex system, known as teletex, is also available. This uses VDU terminals to transmit a variety of text and graphics characters. High quality formats can be used and it is much faster than telex, operating at speeds up to 2,600 words per minute.
5. A facsimile (FAX) system allows the transmission of text, graphics and photographic images.
6. Contacting people on the move is possible using a radiopaging service. By carrying a small radio receiver called a radiopager, people can be contacted wherever they are. Keying their number in on a telephone causes*8.1. the pager to beep. The person then goes to the nearest telephone to get on touch with the caller.
7. A telephone network can be used to connect personal computers to an electronic mail (e-mail) system. Messages sent from a personal computer are stored on a central computer. Users can read and reply to these messages using their own computer.
X. Письменно озаглавьте 6 и 7 абзацы текста.
Вариант 3
I. Перепишите предложения, подчеркните причастие, определите его форму, функцию и переведите предложения на русский язык (см. грамм. справ.: 7.3., 7.3.1., 7.3.2., 7.3.2.1., 7.3.2.2., а также ссылки после *).
1. Phenomena occurring during solar flares are thoroughly uninvestigated.
2. The numbers stored in a data field*2.2. represent a calendar date.*2.2.
3. Having transferred an electron, the adjacent atom creates a new hole.
4. Being heated magnetized steel loses its magnetism.
II. Перепишите предложения и переведите их, обращая внимание на бессоюзное подчинение (см. грамм. справ.: 9.3.2., а также ссылки после *).
1. Program is a set of instructions one should*4.3.,5.6.1. follow.
2. Radioactive isotopes differ from one another in the type and energy of the particles they emit.
III. Перепишите предложения, подчеркните герундий и переведите предложения на русский язык (см. грамм. справ.: 7.2., 7.2.1., 7.2.2., а также ссылки после *).
1. Entering text is done*5.5.1. through the keyboard.
2. As previously stated, the generator is really a machine for converting mechanical power into electrical power.
IV. Перепишите предложения, определите, является ли инфинитив подлежащим или обстоятельством цели, переведите предложения на русский язык (см. грамм. справ.: 7.1., 7.1.1., 7.1.2.,а также ссылки после *).
1. To find the mass of the electron numerous experiments had to*6.3.(3).be made.
2. To complete this experiment will not take much time.
3. Active satellites are equipped to receive and retransmit signals.
V. Перепишите предложения, подчеркните инфинитив в функции определения, переведите предложения на русский язык (см. грамм. справ.: 7.1.2.1.. а также ссылки после *).
1. The quality of speech signals to be transmitted may*5.6.1. degrade.
2. The information to be gained from the experiment is extremely valuable.
VI. Перепишите предложения, содержащие конструкции сложное дополнение и сложное подлежащее (см. грамм. справ.: 8., 8.1., 8.2., а также ссылки после *). Переведите предложения на русский язык.
1. We consider this discovery to be one of the greatest*3.1. of the XX th century.
2. Instrument failure*2.2. in high voltage circuits can cause dangerously high voltage to appear at unexpected points.
3. Computers were supposed to create „the paperless*1.3. office“.
4. The problem of the origin of the Earth proved to be one of the most difficult*3.1. problems of astronomy.
VII. Перепишите и переведите предложения, содержащие условные придаточные предложения (см. грамм. справ.: 9.2.1., 9.3.1., а также ссылки после *).
1. Do not install*4.2.1. software unless you know it is safe.*9.3.2.
2. If these electric and magnetic fluxes could actually be seen, the wave would have the appearance indicated in Fig. 2.
VIII. Определите значения английских слов, исходя из контекста (см. грамм. справ.: 11.18.).
1. Компьютеры – complicated машины.
2. Микропроцессор состоит из set of units.
IX. Прочтите и устно переведите текст, затем письменно переведите 1,2,3,4 абзацы текста.