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Space probe: space probe, deep space probe or space probe. Unmanned spacecraft, the main instrument of space exploration, to explore the moon and the moon in distant objects and space. Space probe loading of scientific instruments, by a rocket into space, fly close to the moon or the planets for close observation, do satellites for long-term observation, landing field or samples for research analysis
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
Off-road car tires -- cross-country cars are the front and rear wheels. Main driving cross-country car tyres in bad road, such as desert, muddy ground, loose soil or other no pavement road, urging tire has high performance and off-road tires tend to use low pressure, sometimes with pressure regulating tire, according to the road condition to adjust the size of the tire pressure. In order to improve the cross - cross section, it is generally used to increase the width of the tire section and rim and reduce the diameter of the rim so as to increase the grounding area and reduce the grounding pressure. The tyre structure is also used in the structure of the meridional structure
Automatic filter is to filter industry widely used a set of equipment, to overcome the traditional filtering products, volume is small, vulnerable to contamination jams, filtering, part of the need to remove the cleaning and unable to monitor the state of the filter and so on shortcomings, with the raw water filter and automatic filter for the discharge of pollutants by automatic cleaning function.
(1) temporary suspension of trains and extra units;
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