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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
Dashboard cameras, also known as dash cams, dashcams, car cameras, car DVRs or even accident recorders, are onboard cameras that continuously record the view via a vehicle's windscreen. They may be connected to the interior windscreen in order to the top from the dashboard, by suction cup or adhesive-tape mount. Dashcams offers video evidence in the eventuality of a major accident that happened traveling. They have become considerably more popular, and there is a huge variety of devices available on the market already in recent years. To don't be the victim of a major accident, you may need a car DVR to record the documentary footage to prove you're innocent. Also, if you feel violations with the rights, you can offer the footage for an insurance company or even the police, to get a lawsuit, or at the criminal trial. You might also desire to record footage really should be course to aid others in case you spot something happening nearby. This could also help improve road conditions with graphic examples on hand, or monitor the driving habits someone else using knowledge.
For most babies, vaccination is safe. However, in order to reduce the occurrence of adverse reactions, new mothers can understand the variety, role, taboos, adverse reactions and matters needing attention before vaccination. Cooperate with the doctor to provide the baby's health condition and the inoculation.
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