... flat gradient 平缓坡度 flat hole 水平炮眼 flat muck pile 平面废石堆 ...
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Flat-bottomed hole 平底孔
Flat-bottomed hole equivalent 平底孔当量
FLAT HOLE PLUGS 平板孔扣塞
flat bottom hole 平底孔
flat-bottom hole 平底孔
hole and flat-stitch embroidering machine 圆孔及平针组织绣花机
flat drop round-hole plate 平落式圆孔排种盘
Flat-floored hole 平底孔
flat drop round hole plate 平落式圆孔排种盘
·2,447,543篇论文数据，部分数据来源于NoteExpress
The only hole I couldn't knock out was the one around a flat, essentially 0% return.
FORBES: Break Their Crystal Balls
The sample comes from a hole about 2.5 inches deep drilled on Feb. 8 in a flat plate of sedimentary bedrock that the space agency managers have named "John Klein" in memory of a Mars Science Laboratory deputy project manager who died in 2011.
WSJ: Rover on Mars Extracts First Rock-Core Sample
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