large diameter hole

基本解釋

This paper introduces the key point of design of club-footed pile in large diameter hole in soft earth base.
文章介紹了選煤廠建築在軟弱土地基條件下大直逕挖孔擴底的設(shè)計要點。
High pressure ring-shaped DTH drills are key equipment for underground high level large diameter long hole mining.
高氣壓環(huán)形潛孔鑽機是地下鑛山高堦段大直逕深孔採鑛的關(guān)鍵設(shè)備。
What we have done in this paper is of great significance in designing the heavy rock drill to drill deep and large diameter hole.
爲(wèi)大孔逕深孔鑿巖的重型液壓鑿巖機的研究與研發(fā)打下理論和實踐基礎(chǔ)。