Вопрос № 348084 - Английский язык

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London Bridge. This fabled 1_______ across the Thames River, noted in story and rhyme, has a colourful and continuous history that dates back to Roman times. The first London Bridge was 2_______ by Romans sometime after 43 AD and some of its wooden remains have been uncovered on the north side of the river. During its life the 3_______ structure was renewed several times. At one time, one of these 4_______ was washed away by a flood, and another was torn down by invading Vikings in 1014.

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Constructed between 1886-1894, Tower Bridge is one of London’s most recognized sights. It is the first of London’s Thames 1_______ and the only one which can allow the passage of shipping underneath. The bridge was 2_______ to be a two-level span: the lower level, a draw bridge which elevates to permit tall river traffic, and the upper level, twin walkways for pedestrians. The observation 3_______ in the north tower permits superb views of the City of London and the surrounding Docklands. The Tower Bridge Museum in the south tower contains the original steam-driven 4_______ that was used to raise the bridge.

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1_______ are of great importance in instruments that use 2_______. 3_______ devices such as cameras, microscopes, projectors and telescopes all produce images with lenses, while many of us 4_______ the world through lenses that correct imperfect vision.

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The lathe is a machine-tool in which work is held so that it can be rotated about the axis. The cutting tool is traveled past the work from one end to the other. It is designed primarily for turning and boring operations. However, in addition to turning and boring, many other operations may also be performed on a lathe. The lathe is considered to be the oldest but still the most important of all machine-tools. Any shop, containing machines or machine-tools, contains a lathe.

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Today railway transport is quiet different than in old times. There are many thousands of locomotives, hundreds of thousands of cars and oil-cisterns. The trains today go much faster. The whole wagon fleet was fitted with continuous brakes, and hundreds of thousands of wagons were equipped with automatic couplings. Many old lines were improved and electrified and the use of diesel traction was begun. Heavy rails were laid extensively and a substantial mileage was equipped with automatic block signaling.

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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.