【单选题】【消耗次数：1】
单开道岔非平行线路联接计算下列参数中哪项是设计者选定的？
①
δ
②
a
③
R
④
α
参考答案：
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【判断题】
、双道起坡是在斜面上布置两个道岔（甩车道岔、分车道岔）形成双轨线路（斜面上形成），空、重车分别设置竖曲线。落平后的双轨存车线长度约2～3钩的串车长度，再接单开道岔联接点，变为单轨。
①
正确
②
错误
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