Here we use a new material subdivision. It is the supply of high and low degree of market risk by analyzing the proportion of the value of the procurement cost of materials and procurement of materials for the size classification [5]
We use a new material subdivision method. It is through the analysis of the cost of material procurement value proportion and the size of the procurement of materials supply market risk level classification [5]
We are here to adopt a new subdivision of the item. It is by analyzing the size and purchase items at cost share of procurement supply market risk exposure level to categorize [5]