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BIM has been gradually applied in subway projects, and has achieved good results in information construction, reasonable arrangement of construction procedures, speeding up construction speed, saving project cost, etc. The application of BIM technology makes many people see its advantages, thus promoting its further development and the introduction of BIM related technologies.Just like Alexander, a cyber security expert and writer? As Krimberg explained to Vox magazine, the destructive power of a full-scale cyber attack on infrastructure "is equivalent to solar flares." In short, this will be devastating.(3) Brand image: The product image is consistent with the temperament of the spokesperson. The match between brand personality and spokesperson is the key to optimize the communication effect. Only when the star's personality is consistent with the brand and the personality is accurately connected can the unique position of products and enterprises be effectively strengthened in communication and identification.未来某天，议员之子帕特里克·罗斯（贾斯汀·拉扎德 Justin Lazard 饰）乘坐远足号登陆火星，成为第一个踏足这个星球的地球人。一如当年的阿姆斯特朗，帕特里克成为全人类的英雄。然而始料未及的是，帕特里克将一种致命的DNA带回地球。人类开始面临新的灾难。The main purpose is to save a state of an object, In order to restore the object at an appropriate time, I think it is more vivid to call the backup mode. Generally speaking, assuming that there are various attributes in the original class A and A, A can decide the attributes to be backed up, memo class B is used to store some internal states of A, and class C is used to store memos and can only store, not modify and other operations. Make a picture to analyze it: