某地区最高轨温 T max =66 °C ,最低轨温 T min = -20 °C ,锁定轨温 25 °C ,线路铺设 60kg/m 钢轨, 钢轨长度 25m ,线膨胀系数 α =11.8×10 -6 / °C ,接头阻力和道床阻力限制钢轨伸缩量为 6mm ,求预留轨缝、允许铺轨的年轨温差、允许铺轨轨下限分别是多少。(60分)
【简答题】Dictation.mp3: Professors (1)______ outside of the classroom, (2)________ . A professor (3)________ but (4)______ for(5)______ . The professor (6)_______ but (7)_______. Professors (8)__________; th...