ТОР 5 статей: Методические подходы к анализу финансового состояния предприятия Проблема периодизации русской литературы ХХ века. Краткая характеристика второй половины ХХ века Характеристика шлифовальных кругов и ее маркировка Служебные части речи. Предлог. Союз. Частицы КАТЕГОРИИ:
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Leveling instrumentsUp-to-date levels, as a rule, have a telescope with internal focusing and are constructed so that it is convenient to observe the position of the level tube bubble when sighting on the rod. Leveling rods have divisions of 1 or 2 cm called value of rod division. When the distance from the level to the rod is 100-500 m it is advisable to use rods with two-centimeter divisions. Every 5 or 10 divisions are joined into groups to help in their reading. The numbers on the rod are written upside-down, so that when observed in the telescope the figures would appear normal. Word List
Вправа 1 Перекладіть словосполучення українською мовою: Differences in elevations, horizontal planes, to determine the difference, value of rod division, at right angles, lines of sight, to coincide with the ocean or sea-level, to observe the position of the level tube bubble, to determine elevation of a turning point Вправа 2 Дайте відповіді на запитання: 1. What planes are called horizontal? 2. What surface may be regarded as a datum surface? 3. Is elevation a distance along a vertical line to the datum surface coinciding with the ocean or sea-level? 4. How many leveling methods are there? 5. What are the turning points? 6. What do up-to-date levels consist of?
Вправа 3 Закінчіть речення: 1. Planes cutting horizontal line at right angles are ……… 2. The surface of still water may be regarded as ………… 3. When the datum surface is arbitrary this distance is … 4. the points common for two neighboring station are called turning, and the others- intermediate points. 5. Differential leveling is if it is needed to determine the difference in elevation between ………………… 6. It is convenient to observe the position of the level tube bubble when ………………….. Вправа 4 Підберіть терміни, подані ліворуч, до їх визначень праворуч:
Вправа 5 Розмістіть речення таким чином, щоб вони були планом прочитаного тексту: 1. The points common for two neighboring station are called turning, and the others- intermediate points. 2. Up-to-date levels are constructed so that it is convenient to observe the position of the level tube bubble when sighting on the rod. 3. Leveling methods can be divided as direct leveling, forward leveling, simple leveling, differential leveling, profile leveling and cross-section leveling. 4. When the datum surface is arbitrary this distance is called elevation. 5. Planes cutting this line at right angles are called horizontal planes. 6. Any surface, forming right angles with the vertical may be regarded as a datum surface. Не нашли, что искали? Воспользуйтесь поиском:
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