bottom unloading of tank cars是什么意思

用法例句

According to fabrication and installation characteristics and construction technology of tar tank in coking engineering technology and crafts are introduced in detail from drawing composing graph, linking of construction procedures, welding requirements to flip chip construction.

针对焦化工程化产区焦油槽现场制作安装特点而制定的施工技术 ,较详细地介绍了从绘制各部分排版图到各部分施工程序衔接、焊接要求、倒装施工的工艺及技术。