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}
Even the cost of motorcycles and cars differ also. Most of the time, cars are more expensive than motorcycles. Because a car is bigger, it is usually expensive for maintain. Cars have more accessories when compared to a motorcycle besides having four wheels. However, there are several motorcycles which is higher priced than the usual car.
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
Features: to overcome the traditional filtering products, volume is small, vulnerable to contamination jams, filtering, part of the need to remove the cleaning and unable to monitor the state of the filter and so on shortcomings, with the raw water filter and automatic filter for the discharge of pollutants by automatic cleaning function, and uninterrupted water washing sewage system, can monitor the working state of the filter, a high degree of automation. The requirements for various filtering precision are covered from 10um to 3000um.
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