【多选题】
缓和曲线的最小长度为20m，主要是从___一节车辆的全轴距而确定的。
A. 短于
B. 不短于
C. 等于
D. 长于
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答案
B
解析
暂无解析
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下列情况的水沟不用采取防止冲刷或渗漏的加固措施的是___。
A. 流速大，可能引起冲刷的地段
B. 路堑内易产生基床病害地段的侧沟
C. 水田地区的排水沟
D. 天沟或截水沟的培堤成沟地段
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根据隧道的断面形式分：有矩形、拱形、圆形、多圆形及椭圆形等多种，但其中最主要的是___两种。
A. 圆形隧道和矩形隧道
B. 圆形隧道和拱形隧道
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