1) Large-medium sized hi-alloy steel tubular products
中大口径高合金管材
3) high density polyethylene pipes
高密度聚乙烯大口径中空壁缠绕管
1.
The excellent characteristic of high density polyethylene pipes are introduced in this paper through comparing with traditional reinforced concrete drainpipes from project practice.
通过与传统钢筋混凝土排水管的比较,结合工程实例介绍了高密度聚乙烯大口径中空壁缠绕管的特性,并介绍了该管材的施工要点。
5) medium-large caliber
大中口径
1.
In order to improve functions of a shell-feeding system for a naval gun,an agile shell-feeding system was designed for a medium-large caliber navy gun.
针对目前我国大中口径舰炮供弹系统急待改进的现状,在借鉴国内外供弹系统现有技术的基础上,提出了一套新型大中口径舰炮敏捷供弹系统。
补充资料：中大
1.宋代京官候选人的别称。
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