2.1.2 the concept of structural diagrams3. contact the structural scheme: the connection between the two parts of the tree structure diagrams. The parts are called constituent parts, the lower part is called the component parts.4. Level in the structural scheme: under the general rule with level 0 level is the final product. Each structural analysis of a product is moved from level i to level i + level number 1 product, contact number in the product structure shows the complexity of the product and production management in ENTERPRISES
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