Mate’s Receipt is issued and signed by the mate of the shipping vessel indicating that the goods have been loaded on board the vessel or the goods have been received by the vessel for loading and can be exchanged for the on board Bill of Lading .
【简答题】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、允许铺轨轨温上下限分别是多少。(60分)