Practical experience and experimental results show that it only takes 3-5 seconds to open the ordinary a-door by using technical means. It will take tens of minutes or even longer to unlock the B-class door. The C-level door lock cannot be opened without the original key. Therefore, the burglars specially aim at class a locks, especially the double-sided one word lock, and implement the technology to unlock the burglars. According to the city police in many places, these lawbreakers usually sneak into the residential area in advance, take the elevator to enter the top floor of the building during the working hours of the citizens, and then enter the corridor one by one. When they are confirmed to be ordinary class a locks by observing the lock holes of the anti-theft door, they reach out and knock on the door. If someone in the room agrees, they say they've found the wrong building number or unit door, and excuse themselves. If it is confirmed that there is no one in the room, it will use tools to open the door lock in a few seconds and enter the room to carry out theft. It can be concluded that the theft of a building by multiple households at the same time is caused by the same group of people.
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