说明：  某炼厂常压塔实测数据和人工化验结果（汽油干点）。假设输入变量为常顶温度、顶回流温度、进料温度、进料压力、常顶压力共5个变量；输出量为汽油干点。试用BPNN建立此常压塔汽油干点软测量模型。
(A certain refinery atmospheric column measured data and artificial test results (gasoline do). Assume that the input variables for the top temperature, reflux temperature, feed temperature, feed pressure, often a total of five variables Do some output for petrol. Trial BPNN the atmospheric column gasoline with some soft measurement model is established.)