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for subject
Drilling
containing
保护的
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all forms
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in specified order only
Chinese
English
保持管具与井壁的间隙的护箍
standoff band
故障
保护的
安全装置
fail safe device
未覆盖保护层的裸管线
bare pipeline
钻头压力
补偿器的保护杯
compensator protector
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