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Based on the complexity of today's technology, the pure practice of technology will require a great understanding, which is the result of many years of experimentation, success, failure, and general experience. Therefore, a great deal of knowledge needs to be stored and passed on to the next generation by experts. Its training and education are conducted in formal and informal education institutions, schools, colleges and universities. Imagine the vast knowledge needed to enter careers such as medicine, engineering and architecture
Space probe according to the detection of object is divided into lunar probe, probe and interplanetary spacecraft, small body such as a space probe to leave the speed of the earth must be large enough to overcome or get rid of the earth's gravity, realize the deep space flight. The probe orbits the heliocentric elliptical orbit (double-cut orbit) that is tangent to the earth's orbit and the planet's orbit, and may meet the target planet; Increase speed to change the orbit, flew to target the planet can shorten the time in order to ensure the detector fly the double track to the planetary orbits and tangent with the target when the target planets also run to it, must be chosen in the earth and the target planet at a particular moment of relative position detector. Detector can fly around the star, the use of planetary gravitational fields accelerate continuous multiple planets orbit the significant characteristic of space probe is, flying in space for long time, the ground cannot real-time remote control, so must have the ability of autonomous navigation; To fly outside the solar system, away from the sun, solar arrays, and nuclear energy systems; It is necessary to adopt special protective structure to withstand very severe space environment. Landing or walking on the surface of the moon or planet requires some special form of structure
A child's fever is the most common and most vexing problem for parents. Common fever, most of which are caused by virus infection. The acetaminophen and ibuprofen, which can be used by children, suggest alternate use. Do not give aspirin and aspirin to your child, and do not use either oral or static antibiotics unless you have a clear cause of fever in hospital assay.
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