扩展式扩孔器  under-ream

迈步式扩孔  Sequential reaming

套式扩孔钻  shell drill; Shell drills; shell core drill

钻孔扩孔  bore hole drilling and enlarging

代数式公式  algorithm expression formula

二项式公式  binomial formula

分布律的公式式  distribution law in formula form

广义二项式公式  binomial formula generalized

合式公式  well-formed formula; WFF; propositional formula

合式公式集  set of WFF

显式公式  explicit expression

行列式公式  determinant formula; determinantal formula

(DHS)空心扩孔器  DHS)Hollow reamer

250B轴承环扩孔机  250B bearing ring rolling machine

Vesic小孔扩张理论  Vesic theory

暴胀式扩张  inflationary expansion

爆炸扩孔  pot

鼻孔扩张器  rhineurynter

冲孔与扩孔  punching and hole-expanding