The overall system design and function analysis, taking into account the convenience of system debugging and maintenance, the software uses a structured design method. Each function in the system is designed as an independent functional module. By installing these functional modules, a hierarchically structured system is formed. The system is divided into 8 subsystems and has 4 levels. Contract Management Module This module has 4 functions: contract entry, contract inquiry, contract modification, contract deletion. Enter the contract to complete the entry of the contract. In order to facilitate the use of the user, a method of combining computer auto-filling, mouse selection, and manual input is adopted. As much as possible, the user can use the keyboard to input data as little as possible. The contract inquiry completes the inquiry work for the contract. All operations can be completed with the mouse, the operation is simple and convenient. According to the function is divided into by product number query, query by product name, query by unit number and by unit name. The contract modification completes the modification of the contract library. This module adopts the cache array technology, that is, first transfer the header of the contract library and the records to be modified to the arrays STR1 and STR2, then modify the array, and then store the data into the contract library after correctness is determined, thus avoiding the data caused by the wrong modification. Lost. The contract deletion completes the elimination of useless data. Arrival Management Module This module registers and checks the purchase, and it is divided into two functional modules: arrival entry and arrival inquiry. Arrival entry records the acceptance of qualified goods into the corresponding database. There are 6 databases involved. The return of defective goods is registered and entered in the corresponding database. Epoxidized Soybean Oil (ESO) is a kind of nonpoisonous and tasteless PVC plasticizer,it can keep steady under light and heat,it's molar weight is about 1000,much more than other plasticier ,so it is very useful for the steady,volatility resistance,lower loss,and extend the useful time for the products of PVC,it can be used in all kinds of products of PVC no matter hard or soft,can not only raise the price ,but also increase their physical property machinability, Epoxidized soybean oil is providing conditions for PVC resin entering area of package. Epoxidized Soyabean Oil,Epoxy Soybean Oil Epo,Epo Auxiliary Agent Oil,Plasticizer Epoxidized Soybean Oil Dongying Kexing International Trade Co., Ltd , https://www.kxiechem.com