If the rate is at the low end of the range and was lower still before a key pipe on top of the blowout preventer was cut to accommodate the top hat, about half as much oil has been spilled so far.
假如现在这个比率是最低的、并且放在防喷器上方的关键性管道适应了高帽之前、仍然保持低比率，那时候泄漏的油约相当于现在已经漏掉量的一半。
An enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well.
套管柱顶部的一根大口径管，形如漏斗，以引导钻井工具进入到井眼的顶部。
The article introduced the main construction technique of open top pipe construction through a top pipe construction project instance of Kunming.
文章通过昆明市某顶管工程实例，介绍了开敞式顶管施工的主要施工工艺。
The article introduced the main construction technique of open top pipe construction through a top pipe construction project instance of Kunming.
文章通过昆明市某顶管工程实例，介绍了开敞式顶管施工的主要施工工艺。
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