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Access control is a system enabling authorities to manage entry to areas and resources inside a given physical facility or computer-based information system. Access control is, the truth is, a typical, everyday phenomenon. For example, a lock over a car door is essentially a sort of access control. The PIN on a bank's ATM strategy is another way of access control. Even nightclub bouncers, browsing front of an 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.
Wide provided suitable for busy trunk, also can be laid in tunnel and station floor maintenance difficulties, stone or soil subgrade are laid, but the mud pumping in the diseases of roadbed must be laid on the roadbed diseases after renovation. The main advantages of the wide sleeper circuit are: the suborbital sinking is small. The vibration acceleration is smaller than the concrete sleeper line, which gradually slows down and stops after laying. So the line maintenance work is greatly reduced, about a third of the general concrete sleeper line. The track is easy to keep clean. Dirt is not easy to break into the bed and prolong the repair cycle of the route. The line is smooth and stable, which is conducive to high-speed operation and the laying of seamless circuit. The disadvantage is that the cost is higher, and it is more difficult to change the shop on the busy trunk line
The personnel of the duty station authorized to set up the checkpoints shall show the highway inspection certificate issued by the general office of the provincial people's government and wear industry inspection marks when performing the inspection tasks. Without the above certificates and marks the illegal inspection.
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