counterbore 详细解释
counterbore
[kauntə'bɔ:]
vt. 扩孔(平头钻, 埋头孔)
n. 用平底扩孔钻扩孔
英英释义
名词 counterbore:
a bit for enlarging the upper part of a hole
同义词：countersink, countersink bit
补充
counterborecounterbore[kauntəˈbɔ:]n.1.(用平底扩孔钻)扩孔[锪孔,镗孔,镗阶梯孔];沉孔,埋头孔热门单词推荐
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