Прочитайте текст и найдите соответствующий перевод подчеркнутого слова Safe operation of freight and...: ответ на тест 439368 - Английский язык

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Safe operation of freight and passenger trains requires a system of signaling. To inform the locomotive and train crew of the position of other trains in relation to their own, signals installed at frequent intervals give indications which are visible both by day and by night. Wayside signals installed along railroad tracks are called fixed signals.

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Safe operation of freight and passenger trains requires a system of signaling. To inform the locomotive and train crew of the position of other trains in relation to their own, signals installed at frequent intervals give indications which are visible both by day and by night. Wayside signals installed along railroad tracks are called fixed signals.

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Locomotives on some railroads are known to be equipped with apparatus located in the cab, which gives a continuous indication to the engineman identical with that shown by wayside signals.

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Thomas Edison (1847-1931). Because of him, the millennium will end in a wash of brilliant light rather than in torchlit of darkness as it began. In 1879, Thomas Edison gave humans the power to create light without fire, by inventing a long-lasting incandescent lamp. Among life’s many conveniences we can take for granted, thanks in part to him: copies, radio, movies, TV, phones (he improved Bell’s). On the night after his funerals, Americans dimmed their lights for the man who lit up the world.

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As the old story shows, people have always thought the wind was angry and destructive while the sun was warm and life-giving. And everyone knows that the wind and the sun are very powerful.
In 1934, the wind blew at 372 kilometres per hour in New Hampshire in the USA. In 1958, a powerful wind called a tornado, in Texas, USA, blew at 451 kilometres per hour.
The temperature in the centre of the sun is about 15,400,000 degrees Celsius. It burns 4,400,000 tonnes of hydrogen every second. The light from the sun is so powerful that it gives life to planet Earth.

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1_______. The bridge, which was over 3 kilometres long, opened in 1878 and fell down in a winter storm in 1879. 2_______.
There was the enquiry into the Tay Bridge disaster to find out why the accident happened. One of the constructions was that the design and construction were based on quickly and cheaply it could be built. Safety and strength were not thought about properly. 3___________ . Also, the design was based on experience rather than the more scientific and accurate calculations used today. 4___________. The results confirm that the design of the bridge was definitely substandard.