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BT in BT investment mode is the abbreviation of build-transfer, which is a kind of rich investment mode created or simplified by Yan Jiehe, a dark horse tycoon on the 2005 Rich List. Compared with BOO (construction-operation-operation) and BOOT (construction-ownership-operation-transfer), BT investment mode has less operation link for the construction party. Its essence is the transformation of BOT (build-operation-transfer) mode, which means that the project management company advances funds to carry out the construction after the general contract, and then transfers the construction to the government department after the construction acceptance is completed. That is to say, advance funds to build infrastructure projects that the Government cannot start for the time being, and then let the Government repay in installments, thus making huge profits.1. State patterns define the relationship between state and behavior and encapsulate them in a class. By adding new state classes, it is easy to add new states and transitions《风起长林》故事始于靖王之子、大梁新帝登基十余年之后，靖王和梅长苏均已仙逝，而前朝后宫权利角逐从未停歇，大梁边境亦风云再起……创作亦将延续“琅琊榜”的内核，即便皇权野心、阴风诡雨代代不断，即便世间没有绝对的公平，不会所有人都得到应有的对待，也依然有这样的一群人做着自己认为正确的事，一颗赤子之心永远炙热。说完，依旧用心诊脉。　　顶尖法学院发生骇人事件，强硬的教授和胸怀大志的学生们面临考验：法律究竟能否伸张正义？毒特警赵刚所领导的特别行动小组是一支直属于公安部禁毒局的精英力量。在一次突袭行动中，赵刚意外的发现了十二吨被隐藏的冰毒，经检验，此种冰毒是在国内由人工化合而成。这一发现，暴露了我国毒情的一大隐患，如不迅速破获将影响我国的国际声誉。特别行动小组的赵刚等人临危受命，誓将制毒者极其相关的毒枭一网打尽，化解我国禁毒史上空前的毒品危机。一场连环的禁毒战役就此打响。特别行动小组往来于云南、广东、缅甸、泰国、香港等地，与各国毒枭开展一次次的勇气和智力的较量。在公安部的全面指挥下，在各省各警种的大力配合下，在特别行动小组不遗余力的强行突破、极限追捕下，四大毒枭相继落网，毒品的制造和贩卖得到了有效的控制，“国家形象”得到了坚决的捍卫和维护。