bit drag

基本解释

Laboratory study of drag bit blade wearing rate has been carried out on a medium size test rig under surface drilling condition.
本文从刮刀钻头几何学和摩擦功等原理出发，推导出了钻头刀翼高度磨损速度方程。
And just as their long, heavy trains pose a burden to peacocks, the extravagant feathers of Anchiornis may have been a bit of a drag, literally.
对于雄孔雀来说，硕长且沉重的尾屏是个沉重的负担，而过多的羽毛可能也同样拖累了近鸟龙。
The bit is usually a drag bit fitted with either PDC or natural diamond cutting structures, but the core bit is unusual in that it has a hole in its center.
钻头通常属于刮刀型，装备有PDC 或者天然金刚石切削齿，但取芯钻头的特别之处在于钻头中心有一孔。
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