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? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:斯蒂芬·金又一部小说将拍成电影：著名编剧AkivaGoldsman将执导新的《凶火》电影版,讲述一对通过实验获得超能力的夫妻生下一个能遭纵火焰的女儿,政府派出特工绑架小姑娘,试图让她成为武器…父女情很感人。1984年曾有一版电影,德鲁·巴里摩尔演那个小女孩,相当厉害。但那版被斯蒂芬·金称为自己小说最烂的改编之一,故事倒是忠于原作,但太乏味了,就像酒店自助餐厅的马铃薯泥。Tong, no unit or individual is allowed to occupy the fire exits to build houses, pile things and set up stalls. The existing flammable building intensive areas in cities and towns should be gradually transformed in combination with the overall planning of cities and towns, and contiguous transformation can be carried out if conditions permit. Fire lanes are generally not allowed to park other vehicles, and residents should be discouraged from building illegal buildings and piling up articles. 3. Requirements for setting up fire lanes in factories, warehouses, storage yards, storage tank areas and large public buildings According to the reflection of each fire fighting squadron in fire fighting practice, When a fire occurs in a large area of factories, warehouses, storage yards and storage tank areas, the fire burns very fast, the fire is fierce, and the fire fighting lasts for a long time. If there is no fire ring lane and flat open space, it will inevitably cause fire vehicles to be unable to enter or leave, which will inevitably cause blockage and make it difficult for fire engines to approach the fire site. Therefore, fire lanes should be set up in factories and warehouses. When a Class a, Class B and Class C factory building occupies an area of more than 3000 square meters or a Class B and Class C warehouse occupies an area of more than 1500 square meters, a flat open space with a width of not less than 6m for fire engines to pass through can be set up along its two long sides. Open yard area for flammable and combustible materials, Liquefied gas storage tank area, For Class a, Class B and Class C liquid storage tank areas, there shall be large public buildings such as fire lanes or flat gymnasiums with a width of not less than 6m and a space of more than 3,000 seats, halls with more than 2,000 seats and exhibition halls with an area of more than 3,000 square meters that can be passed through by fire engines. Because of the large volume, large floor area and large and dense personnel, in order to cause fire, there shall be large public buildings such as the gymnasiums with a flat space of more than 3,000 seats, halls with more than 2,000 seats and exhibition halls with an area of more than 3,000 square meters.嘉靖是十分讨厌太监的。等疼痛过后，才轻声而又坚定地对她道：我不会走的。The column of implementing mediators is as follows:正吵着，樱桃从厨房走出来，皱眉道：洗个碗也吵？小葱也从东厢出来，走到近前问道：啥事？樱桃笑道：没啥事，小女娃们拌嘴，我说她们了。