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Depth indication: you can tell which metal objects detected are buried in depth;
The audi sedan logo is four circles representing four companies before the merger. These companies used to be manufacturers of bicycles, motorcycles and buses. Since the company was originally a merger of four companies, each ring is a symbol of one of the companies.
From lessons on Mandarin pinyin pronunciation to lessons regarding how to convey Chinese numbers, there's a lot for first time learners of Mandarin to examine. Things like dates, basic principles of pronouns and frequently used adjectives and verbs ought to be covered. Words for common nouns like animals, places and things should also be taught. If you are a Chinese teacher of beginning Chinese students, these lesson plans are excellent starting points for all those learners looking to begin a foundation in Mandarin quickly. You have to start somewhere, and anything from greetings to useful survival Chinese is covered of these class ideas.
Sometime in the late 19th century, a forgotten mechanic fastened a primitive engine with a horse drawn wagon creating the initial horseless wagon. The details happen to be lost to history but from that humble beginning, a method of automobile came to be, one that still exercises influence upon us over century later.
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
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