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阐述用ＳＤ流率基本入树建模法对王禾丘能源系统生态工程主导结构的五棵流率基本入树作嵌运算，建立反馈模型，用其可增广流率派生入树、反馈环计算方法给出全部反馈环的过程与结果．
The basic flowrate model of SD flow rate was used to describe the basic flow pattern of five flow rates of Wangheqiu energy system ecological engineering into the tree and the feedback model was established. The method gives the whole process and result of the feedback loop.