[名词解释] 道岔侧线 siding of turnout
[名词解释] 道岔中心 center of turnout
[名词解释] 道岔号数 turnout number
[名词解释] 对开道岔 symmetrical turnout
[名词解释] 单车道岔 simple turnout
[名词解释] 道岔主线 main line of turnout
[名词解释] 三开道岔 three-throw turnout
[问答题] 道岔上导曲线超高设置有何规定?
[主观题]供给曲线(Supply curve)
[主观题]需求曲线(Demand curve)