It provides reference for design and technical modification of vortex burner.
可为旋流燃烧器的设计和技术改造提供参考。
Provide design support for product modification and other technical support activities for products in production.
为产品修改提供设计支持，为产品量产提供技术支持。
The change of project refers the changes of contract caused by the modification of design document or technical specifications, which has great impact on the work of project cost management.
工程变更是指由于设计文件或技术规范修改而引起的合同变更，它对工程造价管理工作有较大的影响。
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