abrasion drill

基本解釋

The invention also comprises an abrasion drill, a bone chisel, a spatula and a drag hook.
磨鑽、骨鑿、刮勺和拉鉤；
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The main abrasion factors of drill holes for filling are analyzed and AHP quantitative method is adopted for Jinchuan Company's case.
分析了充填鑽孔的主要磨損因素，引入層次定量化分析方法，對(duì)金川公司充填鑽孔磨損因素進(jìn)行了定量化分析。
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Flow fields at oil well bottoms, besides to serving the purpose of clearing rock chips and cooling drilling bits, also help to protect the drill bit's surface against excessive abrasion.
井底流場(chǎng)具有清巖和冷卻切削齒的作用，同時(shí)又要保証射流不對(duì)鑽頭表麪造成過(guò)多的磨損。