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The life cycle of an object is managed by Spring, which directly obtains an object from Spring. IOC is the abbreviation of Inversion Of Control, just like control is handed over to Spring from its own hands.Aunt Wang stamped her feet in regret: "I would have bought the genuine product if I had known it." This is the thinking of the poor-ignoring the "iceberg cost". What is iceberg cost? Even the visible cost is often only a very small part. The greater cost is hidden under invisible water.虽然他们战功累累。行了，人都到了，剩下怎么整看你吧。胡钧听了这一席话，顿时怔住了，不由神思恍惚起来。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.PS: If necessary, I can make a video on the skills of Blood River. Please comment or put forward different opinions below. Please indicate Bilibili Xilin Gyoro for reprinting. Explanation of Supporting Victims and No Resurrection