管外保护层;
The article deals with the computer software system for the plug pipe mill, covering such aspects as functions, structure and configuration of hardware and software.
介绍了自动轧管机组计算机软件系统的功能与结构、硬件与软件的配置。
Numerical simulation analysis of pipe in earth covering to large cross-section flat-top burial tunnel
平顶暗挖隧道覆土层内管线数值模拟分析
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