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Covering theory: Covering protection effect. Flame retardants such as boric acid melt at high temperature to form a glassy protective film. On the one hand, it blocks the entry of external oxygen; On the other hand, it diffuses tissue combustible gas to the outside to achieve the covering protection effect on fibers.The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:《心动的信号》是由腾讯视频出品的都市男女恋爱社交推理真人秀节目。纪录片《光照派》揭露了世界上最具争议性的秘密组织光明会的真相。由曾导演过《33 and Beyond》的约翰尼·罗伊尔编导，《光照派》揭示了光明会的起源，展示了内部档案及其教会仪式、授信典礼。朱县令即将离任，许多事还要请他结清才好。张槐问小葱道：你也要去吧？小葱点头。