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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
(1) temporary suspension of trains and extra units;
On one other hand, many individuals declared the five to ten years lifespan of Samsung mini split air conditioning unit is really a major problem. The truth is, this really is simply a minor problem since lifespan is dependent upon use of the master. The large problem is the place the ac did start to malfunction. More often, you may ask an air conditioning unit technician to solve the reason for problems truly you should find replacements for the damaged parts. There are only limited and selected replaceable parts accessible in the United States. Most of the replacement aspects of Samsung mini split air conditioning equipment are available in Korea. The worse occurs when you need to replace damaged parts; you need to give the heating and AC specialist for that completing the repair. In addition, you will find waiting some time to communication barrier between you and the specialist that can turn you to definitely are more frustrated while using current situation. And the aside from these conflicts, you are going to shoulder the shipping fee of $100.
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