题目内容

下列有关运行图的说法正确的是( )

A. 运行图是铁路组织列车运行的基础
B. 目前我国铁路上无法实现平行运行图
C. 小时格运行图主要供列车调度员在日常调度指挥中使用
D. 在我国铁路中存在不成对列车运行图

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