... deprecistion 折旧 depressed center flat car 凹底平车；元宝车 depressed center waggon 中央部位凹底的大货车 ...
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介绍了D 28型凹底平车的研制过程、主要用途、技术参数、主要结构及试验情况等。
Described are the development process, main usage, technical parameters, main structure and testing of the D28 depressed center flat car.
本文介绍了D_（18A）型凹底平车全封闭式大底架结构刚度、强度的计算和试验结果，对与此有关的若干问题进行了分析。
This paper tells the calculation and test results of the rigidity and strength of all-closed large underframes on depressed centre flat cars D18A. Several problems concerned are analyzed.
本实用新型还提供了一种铁路凹 底平车。
The utility model also provides a railway depressed center flat car.
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