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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
General care: after the baby is vaccinated, take a rest and avoid strenuous activity. Do not shower on the day. Pay attention to protect the baby's inoculation site and keep it clean so as to prevent the infection from entering. Give your baby plenty of boiling water (don't drink boiled water for half an hour).
The Geneva motor show known as the "international motor trend indicator", is only the annual auto show in Europe, the rice fort in Geneva airport international exhibition center, a total area of 70000 square meters. The Geneva motor show was founded in 1905. It has been held annually since 1931 in Geneva, Switzerland. The exhibition is held in March every year to showcase luxury cars and high performance reloading vehicles. The exhibits are more personalized. In five major auto show, Switzerland is a country with no auto industry only, but to undertake one of the world's most famous auto show, it always can attract 30 countries each year more than 900 car exhibition, is one of the important auto show in the world. All the booths were visible from the lobby of the Geneva motor show, because the Swiss exhibition rules were detailed and detailed, not allowing large company signs and booths to block the view. The Geneva international motor show is held in Geneva, Switzerland. annual
Besides to be able to unleash your inner want to run free and wildly, you may also sharpen your abilities in driving. Such game like the F1 car racing, by way of example, enables you to go through the racing tracks and compete against other racers. Again, it's not necessary to be worried about your individual safety kinds. Even if you crash you ride or you flip over and over again, that you do not put yourself in the line or jeopardy. The most general benefits you may get from playing this sort of game are:
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