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外贸跟单员需要什么学历,个人做外贸需要什么条件,从事外贸需要

System is composed of multiple material, every matter has one or more attributes, each attribute has the value of the state have a plenty of variables,

Some attributes are divided into more child, each child has a state attribute values, popular says, the attribute value is the state of the material; Rules are various attributes how to interact with each other,

Divided into the same properties of interaction and the interaction of different properties, the rules is the process of the incident, with the cause and effect,

Premise condition, the trigger condition, purpose to describe rules, rules of changes in the material (system).

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