... insulating ferrule绝缘箍, 绝缘套圈 drill with ferrulen.方钻 zirconia-ferrule connector氧化锆套筒连接器 ...
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方钻杆 [油气] kelly ; square drill rod
方钻杆旋转器 kelly spinner
方钻杆补心 [油气] kelly bushing ; kelly drive bushing ; drill stem bushing
方钻杆阀 Kelly Cock ; kelly valve
方钻杆接头 [油气] kelly joint ; kelly bar sub
六方钻铤 [油气] hexagonal drill collar
西方钻石 occidental diamond
方钻杆鼠洞 dilly hole
方钻杆补心导盘 kelly bushing guide skirt
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