Molding in the form of a ring; at top of a column. 以一枚戒指的样式塑造;在一根柱子的顶部。
Time for the third kind of closing well is so long that flange steel ring groove on the top of casing-head is heavily corroded in M4 well being situated in Tarim basin. 位于塔里木盆地的M4井,由于三类封井时间较长,造成套管头上部法兰钢圈槽严重腐蚀。
Using a ring installer, install the top compression ring ( either side up ). 使用一个环安装具,安装顶端压缩环(任意一边向上)。
W'th a ring type receiver at the top the night, of the lightning rod can be reduced and the degree of reduction is proportional to the radius of the ring. 顶部装有环形受雷器避雷针的高度可以降低,降低幅度与环半径成正比。