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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 First, the majority of scratches on DVDs shouldn't really modify the playability of the disc showcased provided you're using reasonably top quality software gain access to the disc contents. In many cases the genuine treatment for any playback problems could be the use of quality software which has built-in correction abilities. Standard Insulating Materials Used in Electrical Engineering. In good communication under the condition of recording device and switching equipment, for the following content can use wireless dispatching telephone, to convey to the value multiplied driver, vehicle operation dispatching command, meet the speed limit operation scheduling command, specified by the into the relationship between interval (standing) in front of the second station attendant tip the driver. The two - line interlocking equipment is provided with good function and two - line reverse direction driving.

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