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。
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。
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。
Ram-type blowout preventer is important equipment used in oil drilling operation.
板防喷器是石油钻井过程中的一种重要设备。
Ram-type blowout preventer is important equipment used in oil drilling operation.
板防喷器是石油钻井过程中的一种重要设备。
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