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Garage door opener will be the largest mechanical section of your property. Sometimes, you never give consideration on it, until it in time breaks down. When it made a decision to go wrong, what should you do? You may be think about repairing. You just pay a few bucks and think now it's in working condition like before. But it is far from the truth. If once it designed a problem, there exists a possibility it could make the common problem again.
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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
"Okay, I'll go." I took the potions of the three patients in bed of six, seven and eight, and hurried to the ward in front of the family. Put the potions one by one on the bed number and name, keep the infusion smooth, and then explain to the patient's family. "Six bed zhang big ye, you last night diarrhea, now dozen of medicine mixed with potassium chloride solution, drop number control at 30 droplet each minute, you can't go to disorderly to adjust the number of droplet yourself. If you play fast, you will not only feel the pain in the needle, but you will also be killed. Please feel free to tell us any
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