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Depth indication: you can tell which metal objects detected are buried in depth;
Generally speaking, the invention of technology is the materialization of scientific knowledge and experiential knowledge, so that the theory and knowledge which can be applied can be realized. The development of modern technology and the guidance of scientific theory have become the "application of science" to a great extent. However, the development of modern science is also inseparable from technology, which often becomes the aim of scientific research, and the development of technology provides the necessary technical means for scientific research. There is a relationship between them, mutual promotion and mutual restraint. Predictably, their connections will become more intimate and boundaries will blur
Access control is often a system enabling authorities to regulate use of areas and resources in a given physical facility or computer-based information system. Access control is, in fact, a typical, everyday phenomenon. For example, a lock on the car door is basically a type of access control. The PIN on a bank's ATM system is another form of access control. Even nightclub bouncers, browsing front of the door, are another demonstration of (perhaps) a more primitive mode of access control. Using an access control mechanism is very important when persons aim to secure confidential, important, or sensitive information and equipment.
While the doctor can directly observe the inner ear canal through the ear lamp or the mirror, the earwax can be taken out directly with a q-tip or medical tweezers. When the earwax has formed and the earwax is hard to remove, the doctor can also use ear drops to soften the earwax. The softened earwax is expelled from the external auditory canal and is easy to clean.
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