下列符合全国铁路列车编制原则和规律的有()。
A、首都开出的列车统为下行、单号
B、关外南往北、东往西的列车为下行、双号
C、关外北往南、东往西的列车为上行、双号
D、列车车次编号一律以起始方向定编,全程不变号
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A、对
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