1) large diameter long pipe
大口径长管
1.
The measuring principle of roundness and straightness for the inner hole of the large diameter long pipes is discussed in this paper, which is based on the research of the status in quo and the trends on this area.
本文在了解国内外所研究大口径长管的直线度、圆度测量的现状和动态基础之上，对大口径长管内孔的圆度、直线度的测量原理进行了研究、分析，比较了多种检测方案，在此基础上进行了测量装置的总体结构设计，光路及电路的原理设计。
5) large diameter pipeline
大口径管道
1.
Furthermore, joint construction of such a large diameter pipeline is done for the first time in our country.
西气东输金昌压气站动火连头施工属于一级动火施工,危险系数大,安全标准高,同时具有工期紧、连头管径大、参加施工单位多等特点,且如此大口径管道动火连头施工在我国尚属首次。
6) big diameter square tube
大口径方管
补充资料：次大口径成品油管道(见大口径原油管道)
次大口径成品油管道(见大口径原油管道)
small big inch products pipeline
次大口径成品油管道比m“，。彬duet、pipeline)见大。径原油管道。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条