底孔一般是指用丝锥攻内螺纹之前所预制的孔的直径，一般指加工件的内置圆孔，最底或最面上的圆形孔洞，称之为底孔。
n. underport
misc. bottom hole
平底孔 Flat-bottomed hole ; flat bottom hole ; FBH ; Holes with Flat Bottom
平底孔当量 Flat-bottomed hole equivalent ; equilent flat bottom hole
螺纹底孔钻 Tap borer ; Tap wearyr
底孔导流 [水利] bottom outlet diversion
螺纹底孔 Thread Bottom Hole ; Thread holes
船底孔洞 scuttle
底孔钻头 Pilot Bit
导流底孔 diversion bottom tunnel ; bottom diversion outlet
泄水底孔 bottom discharge orifice
Under certain incoming,as the decrease of bottom aperture and conical distance,the concentration rate is increased. The results is important guilding significance to the optimization of shuttle-conical tube.
进流量不变时,浓缩率随着底孔孔径和锥圈间距的减小而增大。
参考来源 - 梭锥管混浊流体分离装置水沙分离试验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本文结合岩滩泄水底孔减压试验，讨论了三个问题。
Three problems on the depression test of Yantan outlet are discussed.
施工实践证明，底孔压浆混凝土强度高于普通混凝土强度。
The construction practice proves that the grouted concrete strength higher th an the normal concrete strength.
本论文为加工主轴箱箱体右侧十个螺纹底孔的组合钻床的设计。
This thesis combination machine for design processing many stalks the box ten screw threads of rights the bore bed.
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