LKJ基础数据变更是指开通新线、既有线的运输基础设备、设施技术数据变化或行车组织方式变化引起《列车运行图技术资料》“LKJ基础数据”内容的改变。铁路局应科学合理划分和界定LKJ基础数据变更轮次，一个线路区段每轮LKJ基础数据变更开始的时间间隔不应（ ）。
Cabinet Agencies are chartered by the U.S. Constitution, and are lead by a Secretary who reports directly to the President of the United States.Important Each of these agencies has its own CIO, or Chief Information Officer.Expand table