The annulus testing technique, in which the instrument is up and down through the annulus space between the tubing and casing, is regarded as the best testing method at home and abroad.
从抽油井油套环形空间起下下井仪器，直接测试油井生产动态参数的环空测试技术，被公认为是抽油井最佳测试方案。
An endoscope (which contains a surgical light and small camera) is placed through the tube, allowing the surgeon to view the annulus, disc, and epidural space on a video monitor.
经工作套管放置内镜(它带有手术光源和小摄像机)，允许外科医生通过视频屏幕观察纤维环、椎间盘、硬膜外间隙。
Let B be a complex vector space generated by some simple closed curves in the annulus.
设B是一个复的向量空间，它是由环链在平环上的简单闭曲线生成。
Let B be a complex vector space generated by some simple closed curves in the annulus.
设B是一个复的向量空间，它是由环链在平环上的简单闭曲线生成。
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