non-magnetic drill collar [油气] 无磁钻铤
SMDC short magnetic drill collar 短无磁钻铤
magnetic drill collar
磁性钻铤
以上为机器翻译结果，长、整句建议使用 人工翻译 。
As such, magnetic particle inspection for the screw thread of the drill collar is very necessary and important.
因而钻铤内外螺纹的磁粉检测十分必要和重要。
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