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我国铁路智能勘测实现北斗系统替代GPS新突破,????????ζҵ?ĵ?????Դ??1955???㶫??ɽ???????????????ĸ????ʱ????ɽ????25?ҽ??ϲ????飬?????һ???µĽ??ͳ?????ʱ?????콴?Ĺ?ģ????콫?齨??Ľ??ͳ?????Ϊ????????ͳ?????。
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