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nature : an automatic control technology. Under pressure from the nozzle jet or air flow known as Jet. Use of Jet certain physical phenomena such as entrainment, wall effects caused the jet different functional components, accessories and components control circuit, so the jet direction, the control can be achieved, for example, by automatically switching time programmed itinerary programmed so. Advantages are : (a) simple structure, operational safety, low cost, quick; (2) from various kinds of radiation, electromagnetic effects and corrosion resistance, earthquake and antiknock high and low temperature resistant characteristics suitable for various applications environment; (3) Jet yuan small pieces can be done, and electronic technology can achieve integration. The main drawback is : reaction moves slowly than electronic components, but not the remote control. Widely used in the chemical industry, petroleum, machinery, electricity, metallurgy, textiles, shipbuilding, Instrumentation and national defense industry.
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