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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
Ideally suited for a wide range of applications, the PURe® aluminium windows are available as tilt and turn or casement windows. Senior’s innovative door range also features a choice of the PURe® FOLD and PURe® SLIDE options.
20 cycles each hour. The single acting hydraulic cylinders have drainage facility and top platform includes a smooth surface. The hearings on pivot points are self lubricating along with the hydraulic power pack inside table are provided with relief valve against overloading and compensated flow valve for controlled lowering speed. The electrical equipment is controlled by an electronic system that carries a low voltage transformer and thermal overload protection. A wide range of accessories can be found combined with lifts to accomplish even higher safety functions where conditions require.
Beijing international automobile exhibition since its inception, the scale expands unceasingly, the exhibition features from the past simple product display, develop to become the enterprise development strategy today distribution and comprehensive image display window; The world's most cutting-edge technology innovation information exchange platform; The most efficient brand promotion stage. The quality of the exhibits has been improved, and the impact is also becoming more and more widespread. Many multinational auto companies have listed the Beijing auto show as the global a-level auto show. Receives exhibits fine and brand, the international exhibition concept and characteristic, the Beijing auto show has become the brand of has higher popularity in the international exhibition, for the development of China's automobile industry, the establishment and development of independent brands play an important role, and to promote exchange and cooperation of Chinese and foreign automobile industry, for the rapid development of Chinese exhibition economy has made a positive contribution
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