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BIM's information model can be used by managers to query, modify and call, synchronously update system information, and better maintain equipment and buildings. The operation and maintenance of buildings usually include monitoring, communication, ventilation, lighting, elevators and other systems. If the above equipment and pipelines fail, they may affect the normal operation of buildings and even cause safety accidents.Note: Ref is used here to inject another objectThe full name of DFU is Development FirmwareUpgrade, which actually means the forced upgrade and downgrade mode of iPhone firmware.骂三儿媳是荡妇，恨得牙痒痒。郑氏摇头，对他们道：说起来轻巧。她拉着素谨的手。The son of the former version, Destroy Shooting, his strength comes from his power magnification. Since the 1.03 power magnification was cut, the glory is gone forever. The landlord here accurately tests the power magnification of destructive shooting.