常见例句双语例句This paper describes the top structute of Mode C down-the-hole butten bit, including the top shape, fragments blowdown space, butten shape and but-ton distribution, etc.文中对C型潜孔柱齿钻头头部的端面形状、排渣空间、柱齿形状及分布等问题加以阐述。 返回 butten