【单选题】
测量现场正矢时如果曲线方向很差，应先粗拨___，但应在新拨动部分经
A. 一次
B. 两次
C. 三次
D. 四次
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答案
A
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对于连接市中心与周边卫星城的线路及开行大站快车线路，平均站间距离大，其最高运行速度应大于___。
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测量现场正矢时，应在好天气下进行，弦线必须拉紧，弦线的两端位置和量尺位置要正确。测量时应在轨距线处量，有肥边应在肥边处量，肥边大于___时应铲除再量。
A. 2mm
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【单选题】
根据测试，当离心加速度在0.4～0.5m/s2时，乘客还能够在车厢内自由走动，而当超过___ 时就感到行动困难了。
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【多选题】
社会的物质性体现在___
A. 劳动是社会产生和存在的决定性因素
B. 在社会中不存在精神的现象和活动
C. 物质资料的产生是社会历史的前提
D. 全部社会生活在本质上是实践的
E. 社会生活中不存在物质关系以外的其他关系
