Вопрос № 348086 - Английский язык

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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 see the world through lenses that 4_______ imperfect vision.

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1_______. Some people find that wearing contact lenses is better for their lifestyles, while others find them cumbersome and enjoy the ease of wearing eyeglasses. 2_______. Soft contact lenses are extremely thin and comfortable to wear. 3_______. Rigid gas permeable contact lenses are made of hard plastic that gives crisp, clear vision and corrects most vision problems. 4_______.

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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.

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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.