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В ОБУВНОЙ МАГАЗИН С ОПТОВОЙ БАЗЫ ПРИВЕЗЛИ 800 ПАР ОБУВИ ЧТО СОСТАВИЛО 10 % ВСЕЙ ПАРТИИ ОБУВИ Сколько пар поступило на оптовую базу
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Предмет:
Математика -
Автор:
giggles30st - 6 лет назад
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Ответы 1
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800 : 10% = 800 : 10/100 = 800 : 10 * 100 = 8000 пар
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Автор:
tigger35 - 6 лет назад
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I. Answer the questions
1.What is modern hardware for surveying?
2. How was compass improved?
3. What can be determinedwith the triangulation method?
Surveying Techniques
A standard Brunton Geo compass, still used commonly today by geologists and surveyors for field-based measurements. Example of modern hardware for surveying (Field-Map technology): GPS, laser rangefinder and field computer allows surveying as well as cartography (creation of map in real-time) and field data collection.Historically, distances were measured using a variety of means, such as with chains having links of a known length, for instance a Gunter's chain, or measuring tapes made of steel or invar. To measure horizontal distances, these chains or tapes were pulled taut according to temperature, to reduce sagging and slack. Additionally, attempts to hold the measuring instrument level would be made. In instances of measuring up a slope, the surveyor might have to "break" (break chain) the measurement- use an increment less than the total length of the chain.
Historically, horizontal angles were measured using a compass, which would provide a magnetic bearing, from which deflections could be measured. This type of instrument was later improved, with more carefully scribed discs providing better angular resolution, as well as through mounting telescopes with reticles for more-precise sighting atop the disc (see theodolite). Additionally, levels and calibrated circles allowing measurement of vertical angles were added, along with verniers for measurement to a fraction of a degree—such as with a turn-of-the-century transit.
The simplest method for measuring height is with an altimeter — basically a barometer — using air pressure as an indication of height. But surveying requires greater precision. A variety of means, such as precise levels (also known as differential leveling), have been developed to do this. With precise leveling, a series of measurements between two points are taken using an instrument and a measuring rod. Differentials in height between the measurements are added and subtracted in a series to derive the net difference in elevation between the two endpoints of the series. With the advent of the Global Positioning System (GPS), elevation can also be derived with sophisticated satellite receivers, but usually with somewhat less accuracy than with traditional precise leveling. However, the accuracies may be similar if the traditional leveling would have to be run over a long distance.
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