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Access control is really a system enabling authorities to regulate access to areas and resources in the given physical facility or computer-based information system. Access control is, the truth is, perhaps the most common, everyday phenomenon. For example, a lock on the car door is actually a kind of access control. The PIN over a bank's ATM product is another type of access control. Even nightclub bouncers, browsing front of an door, are another example of (perhaps) a much more primitive mode of access control. Using an access control mechanism is vital when persons attempt to secure confidential, important, or sensitive information and equipment.
To make the contaminated liquid clean to the state of production and life, which is to make the liquid to a certain degree of cleanliness.
Space probe: space probe, deep space probe or space probe. Unmanned spacecraft, the main instrument of space exploration, to explore the moon and the moon in distant objects and space. Space probe loading of scientific instruments, by a rocket into space, fly close to the moon or the planets for close observation, do satellites for long-term observation, landing field or samples for research analysis
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