普通无缝线路轨条长度应考虑线路平纵断面条件及道岔、道口、桥梁、隧道所处的位置,小半径曲线、列车制动、停车、起动、钢轨顶面擦伤严重地段,应单独布置轨条。
参考答案:对
Chinese students usually spend ______ the students of the US studying in their free time.
A.twice as many hours as
B.as twice many hours as
C.twice hours as many as
D.as many as twice hours
以下关于颐和园造园思想的选项中,不正确的是()。
A、认为“普天之下,莫非王土”
B、藏有古代帝皇希冀长生不老的意愿
C、不带有政治性的表达
D、表现了仁政思想