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Gate management principles: 3.5 to 4.95 M by crystals of sinusoidal oscillation, dividing by the frequency divider is about 7.8 K sine wave, the triode power amplifier input after door plank with coil (7) large coil electromagnetic launch, by the gate 1-6 area to receive coil respectively. After receiving, the received signal are compared with those of the reference signal, found that after the change, change the acquisition card output level, the CPU in 300 milliseconds for 6 location data acquisition card scanned, determine the metal's location and output display
The world intellectual property organization in 1977 edition of the licensing handbook "for developing countries to use, to the definition of technology:" technology is knowledge for the manufacture of a product system, the adoption of a process or provide a service, regardless of whether this knowledge is reflected in an invention, a shape design, a utility model, or a kind of new plant varieties, or reflected in technical information or skills, or reflected in the expert for the design, installation, run a factory or maintenance or for managing a business or its activities and provide services or assistance, etc." This is by far the most comprehensive and complete definition of technology in the world. In fact, the intellectual property organization defines all the scientific knowledge that can bring economic benefits to the world as technology
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