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我国地铁和轻轨均采用________kg/m的重型钢轨。
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我国地铁和轻轨均采用________kg/m的重型钢轨。
A、40
B、43
C、50
D、60
时间：2021-09-06 19:50
关键词：
青书学堂
石家庄铁道大学城市轨道交通.
答案解析
D
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