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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
To make the contaminated liquid clean to the state of production and life, which is to make the liquid to a certain degree of cleanliness.
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
For a ceramic item which is often used with food say for example a plate or mug ' an epoxy adhesive is usually recommended. Epoxy adhesives are water-tight and therefore are therefore dishwasher friendly and provide a flexible and durable bond. This glue would suit outdoor ceramics too. These adhesives tend to set clear, yet it's always best to check before purchasing. You must also decide whether you'll need a slow setting or instant adhesive. If it can be a tricky or precise fit, fast acting glue may dry too fast. If the ceramic item sits dormant with food, like a chipped porcelain figure ' super glue can be utilized. Super glue resists modest heat and dampness, however, if the item is generally washed it can be advised make fish an epoxy adhesive be utilized instead. Super glue will dry relatively quickly, so make sure that you be aware of exact position essential for the broken piece.
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