drillings
... 最低水平巷道：sill drift 钻用金刚石：drill bortz 钻眼装置：drilling device ...
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钻头用的金刚石粒 boartz
钻探用特种金刚石 Creams
钻探用金刚石 diamond for drilling
工业用钻石工业金刚石 industrial diamonds
·2,447,543篇论文数据，部分数据来源于NoteExpress
阐述了难钻进地层用新型金刚石钻头的结构、制造特点，射流式钻具的原理、类型，以及防塌型稀释剂的作用机理。
The structure and manufacture of new type of bits, working principle and types of fluidic drilling tools, action mechanism of anti-cave-in thinners, for difficult formation drilling were discussed.
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