parallel-hole collimator 准直仪

parallel hole connection 炮孔并联

parallel-hole blasting 平行孔掏槽爆破

parallel-hole cut 平行炮孔掏槽

parallel hole cut 平行孔钻进

parallel hole drilling 平行孔钻进

vertical parallel hole 垂直平行孔

parallel hole collimator 平行孔型准直器

parallel hole resolution phantom 释义平行孔隙分辨力体模