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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
Web development includes web site design, client side/server side scripting and network security configuration, and e-commerce development. Web development consists of simple static single page plain text based services as well as complex web based Internet applications and social networking services. Web development is the procedure of designing and creating applications for enhanced functionality within websites. Web development deals more with creating, coding and building the framework of a site and also other applications. The main portion of web development is web design.
Vehicle identification numbers are an essential tool for law enforcement officials agencies in their efforts for preventing car theft and hijacking, tracking down car thieves and helping consumers avoid buying stolen vehicles. Since a great deal of used vehicles being sold nowadays are already previously stolen, carrying out a VIN check is critical when buying pre-owned vehicle. The most reliable means for making sure that there is an correct VIN is obtaining it from the automobile, rather than the car's title, since the number available on that document may not be written down correctly.
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