The engineering modification is also the contract modification, which means that some modification, superaddition or canceling is done in content of contract.
工程变更也就是合同变更，是指对合同中的工作内容作出修改，或者追加或取消某一项工作。
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The tool includes five modules: data access module, metadata management module, data superaddition module, task management module and data transform, loadable module.