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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
Car thieves tamper while using VIN number of a stolen vehicle to be able to sell its parts, license it within a new identity, or get the vehicle from the country. A VIN can be changed in several ways, but the most-commonly used methods include removing in the part in the car where the VIN is found and replacing it with a new part, grinding, or changing one or multiple numbers or letters of the VIN. That is why, when buying a used car, always look at the places where a VIN is generally located, to check out signs that indicate it has been tampered with.
The Windows operating-system itself features a amount of features that permit locking down and protecting a PC such these settings are scattered all over the main system (e.g. inside Windows registry, in configuration files and several other places). Preparing a PC for the specialized use case could be very challenging and time-consuming.
New Car Buying Tips--
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