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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 Diarrhea can make children repeatedly the moisture loss, dehydration, in order to prevent children can give children drinking efficient and cheap oral rehydration salts (ORS), must be in accordance with the instructions or as directed by a doctor, ensure the correct dosage. Children with diarrhea generally do not need to fast, even if they want to fast, should not exceed 6~8 hours. Because fasting may cause hunger and diarrhea in children, dehydration and electrolyte disorders occur. Don't eat high-protein, nutrient-dense foods, or they may exacerbate diarrhea, which is bad for the children's gut. Remove the battery from the laptop and identify which sort it's. It will be printed on the case somewhere, and you will be either a Nickel Cadmium (NiCd,) Nickel Metal Hydride (NiMH,) or Lithium Ion (LiON.). If it is among the first two sorts this strategy is the main one to work with. If however it's a Lithium Ion type then don't use the following technique, as it may have at best no effect, or at worst damages your battery.

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