This type of preventer should only be used as a last resort.

这类防喷器仅应作为最后手段。

youdao

Variable bore ram-type blowout preventer, as an improved blowout preventer, is capable of sealing around drill pipes with a range of sizes and has advantages such as low cost and convenience.

可变径闸板防喷器作为新型的闸板防喷器，能够密封一定范围内多种规格的钻具，具有成本低、使用方便等特点。

youdao

Variable bore ram-type blowout preventer, the improved type, is capable of sealing drill tools whose sizes are within a certain range, and has advantages of low cost and convenience.

可变径闸板防喷器作为新型的闸板防喷器，能够密封一定范围内多种规格的钻具，具有成本低，使用方便的优点。

youdao

Would a different type of culture have motivated BP to check that blowout preventer on the Deepwater Horizon rig?

FORBES: Company Culture and Corporate Responsibility