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【单选题】
关于道床，下列说法不正确的是（ ）。A.
道床顶面宽度等于轨枕长度与道床肩宽之和
B.
道床断面包括道床厚度、顶面宽度和边坡坡度3个主要特征
C.
碎石道砟根据材料性能及参数指标将道砟分为一级和二级，我国京沪高速铁路设计暂规中制订了特级碎石道砟材质标准
D.
道床能够提供纵、横向阻力，阻止轨枕纵、横向移动，保持轨道的正确位置
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皮皮学刷刷变学霸
举一反三
【简答题】明确新时代() ,必须坚持以人民为中心的发展思想,不断促进人的全面发展、全体人民共同富裕
【单选题】The civilization(文化) of the Renaissance was the creation of prosperous cities and of rulers who drew substantial income from their urban subjects in the Italian city states and the countries of Englan...
A.
was an ideological movement throughout the world
B.
took place in Italy only
C.
was originated in Italy
D.
was influential in most European countries
【简答题】remaining-useful-life (RUL) prediction
【单选题】When the two colleges first met to play 'football', the players followed ______ .
A.
the rules of soccer
B.
the rules of rugby
C.
different rules
D.
college rules
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