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Spacecraft flew hundreds of thousands to hundreds of millions of kilometers from the earth, injecting speed when the size and direction of a slight error, arrived at target planets will appear large deviation error, for example, when Mars probe injecting speed 1 m/s speed (about one over ten thousand), arrived at Mars, about 100000 km distance deviation. Therefore, precise control and navigation must be carried out during the long flight. Flying to the moon is usually controlled by the orbital control system of the ground and space probe (see orbit control). Interplanetary flight distances, radio signal transmission time is long, the real-time remote control, can't so planets and interplanetary spacecraft orbit control system shall have the ability of autonomous navigation (see interstellar travel navigation and control). The United States, for example, "pirates" spacecraft in space flight of more than eight hundred million km, for 11 months of 2000 times of autonomous orbit adjustment, the final surface to achieve a soft landing on Mars, placement accuracy up to 50 km. In addition, in order to ensure the accuracy of the orbit control engine, the communication antenna is always aimed at the earth, and other systems work normally, and the detector has the autonomous attitude control ability
Many people may well not realize the need for electricians but it is hard to do with out them. They do variety of works including fuse and wiring installation in factories, residential homes or commercial buildings. The work won't only revolve around new installations but in addition include maintenance work. This profession could be dangerous occasionally mainly because it involves high voltage wiring and so you must be thoroughly trained along with cautious when handling any type of electric equipments. Electricians may also be associated with other pursuits for example the video and data wiring along with the installation and maintenance of other electrical instruments. So the electrician professional is extremely diversified and a lot of people normally specialize more in a single specialty over the other.
Since December 22, 1900, Daimler (Daimler Motoren Gesellschaft - -, DMG) offer the world's first to its clients with Mercedes (Mercedes) is a brand of car, mercedes-benz will become the model of the auto industry. Its brand logo has become one of the most famous car brands in the world. For more than 100 years, Benz brand has been a pioneer in automobile technology innovation. On January 29, 1886, two germans, Carl Benz and gottlieb Daimler, patented the world's first automobile, marking the birth of the world's first car. It was then called the birth day of the car. More than one hundred years have passed, mercedes-benz has already spent his birthday, and in the more than one hundred years, with the vigorous development of the automotive industry, has sprung up a lot of manufacturers, also has a great, but in the end is just a flash in the pan. To this day, it can survive the wind and rain, but three or four, and the century-old store, only the Benz.
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