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Track ballast should never be laid down less than 150 mm (6 inches) thick, [5] and high-speed railway lines may require ballast up to 0.5 metres (20 inches) thick. [6] An insufficient depth of ballast causes overloading of the underlying soil , and in unfavourable conditions, overloading the soil causes the track to sink, usually unevenly. [ 7 ]
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]
Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.
The Grand Prix was an all-new model for Pontiac in the 1962 model year as a performance-oriented personal luxury car. [3] Based on the Pontiac Catalina two-door hardtop, Pontiac included unique interior trim with bucket seats and a center console in the front to make the new model a lower-priced entry in the growing personal-luxury segment. [3]
The introduction of medical x-rays during this period dramatically improved medical diagnostics. Discovered by Roentgen in Germany in 1895, x-ray units were in operation at the Toronto and Montreal General Hospitals by the turn of the century. The sphygmomanometer or blood pressure meter, that familiar device employing a cuff placed around the ...
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