[机] 钻孔
1. 钻孔：从设计的角度来看,一个过孔主要由两个部分组成,一是中问的钻孔(drill hole),二是钻孔周围的焊盘区. 这两部分的尺寸大小决定了过孔的大小. 很显然,在高速、高密度的PCB设计时,设计者总是希望过孔越小越好,这样板上可以留有更多的布线空问,
2. 井眼;探坑：drill hole spacing 井距 | drill hole 井眼;探坑 | drill in 套管钻进
3. 排放钻孔：drill hammer 凿岩机 | drill hole 排放钻孔 | drill hole depth 钻孔深度
4. [机] 钻孔：16. drill master n. [军]教官,训练者,教练 | 17. drill hole [机] 钻孔 | 1. drum out v.轰走,开除
1. A rescuer surnamed Jiang said that the rescue plan was to drill a hole through which they could put life detection instruments.
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2. Then the rover will use the same arm to drill a tiny hole in the surface and give scientists a glimpse of its interior.
3. danci.911cha.com
3. Rescuers then will use a wider drill to drill a hole 71 centimeters across, wide enough to pull the miners to the surface.
4. The first step will be to drill a " pilot hole " similar in size to the other three.
5. Workers pounded on a steel drill bit but heard nothing from below, and a camera and a microphone lowered into the hole detected no sign of them.