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The annular BOP is the important assembly of the blowout preventer control system.
环形防喷器是井口防喷控制装置的重要组成部件之一。
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It is an inside BOP (blowout preventer)in the drill string.
投入式止回阀是钻柱内防喷器。
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It is an inside BOP (blowout preventer)in the drill string.
投入式止回阀是钻柱内防喷器。
youdao