... back cut-off power recorder 反向截止功率记录仪 back-off joint 倒扣短节 random back-off 随机退避 ...
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When coring barrel gets stuck downhole, it is very easy to back off safety joint to trip out inner barrel and cores, and only left outer barrel for fishing operation.
当岩心筒在井下被卡住时，很容易地从安全接头螺纹处倒开，起出内筒和岩心，只留下外筒进行打捞。
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