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地暖下面有电线
巨石下面有黄金
巨石下面有黄金
In ancient times,a king had a boulder1placed on a roadway.Then he hid himself and watched the passers-by.He wondered if anyone would remove the huge rock.Some of the king’s wealthiest merchants and courtiers2came by and simply walked around it.Many loudly blamed the king for not keeping the roads clear,
合理确定线路提速改造工程的平面有关参数
合理确定线路提速改造工程的平面有关参数
讨论了提速线路改造工程中的线路平面参数问题 :( 1 )最小曲线半径 ;( 2 )缓和曲线长度 ;( 3 )圆曲线和夹直线长度 ;( 4 )采用反向曲线变更线间距可不设缓和曲线的最小圆曲线半径 ;( 5)复曲线可不设中间缓和曲线的两圆曲线最大曲率差 ;( 6 )超高 ;( 7)线间距。
