【简答题】A.McDonald' s is so successful because of its convenience. B.McDonald' s is so successful because of its food so delicious. C.McDonald' s is so successful because of its formula and diversity. D.McDon...
【简答题】无砟轨道以其高稳定性、()和少维修等特点,在铁路运营中逐渐取得明显优势,尤其是随着()和高速铁路的修建,无砟轨道更显现出其优越性和重要性。
【判断题】从一些国家的高速运营经验来看,设计时速300km/h以上的高速铁路采用无砟轨道结构比有砟轨道结构更具有优越性。