·2,447,543篇论文数据,部分数据来源于NoteExpress
AJ type safety joint is a specialized joint consisting of two parts. The specialized joint takes protective effect for drilling stem in drilling, repairing and test oil (gas) engineering, etc.
AJ型安全接头是一种由两件组装起来的专用接头,是钻井、修井、试油(气)等工程中对钻柱起保护作用的一种专用工具。
youdao
应用推荐
模块上移
模块下移
不移动