求翻译：4.2.2指挥部：发生重大事故时，由指挥部发布和解除应急救援命令、信号，组织指挥实施救援行动；并向外相关部门进行汇报或请求支援。组织事故调查，总结应急救援经验教训。是什么意思？

4.2.2 Command: when a major accident, released by the headquarters and the lifting of the emergency rescue command signal, organize and direct the implementation of relief operations; and outside the relevant departments to report or request support. Organization accident investigation, the summary

4.2 .2command: event of a major emergency, published by the command and the emergency services command, signal, and organization and command the rescue operations; and the report or request support. Organization summary investigation of the accident, emergency and rescue experience.

4.2.2 headquarters: When has the significant accident, by the headquarters issued and relieves the emergency recovery order, the signal, the organization direction implementation rescue motion; And outward is connected the department to carry on the report or the request support.The organization acc

4.2.2 command: when a major accident occurs, and the lifting of emergency rescue command, issued by the command signal, organizing and commanding the implementation of rescue operations and reporting to relevant departments or request support. Organization of accident investigation, concluded emerge

正在翻译，请等待...