One of the devices most prized by gadget collectors, the Curta Calculator is a modern Difference Engine - an entirely mechanical calculating machine capable of great precision.
最受装置收藏家推崇的设备之一，CURTA计算器是一台现代差分机——一台能进行高精度计算的全机械结构计算器。
Subgrade and pavement mainly bear the vehicle loads under the transport conditions. The actual working state of the subgrade and pavement has difference from the static mechanical calculation system.
路基路面结构在运营中主要承受交通车辆的作用，它的实际工作状态与现行的静态力学计算体系有较大的差距。
What is the difference between Mechanical Engineers and Civil Engineers ?
机械工程师和土木工程师的区别是什么？
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