常見例句雙語例句This paper mainly analyzes the cause and brings forward preventive measures of longitudinal crack from bolt hole of the sleeper.本文主要對(duì)我國混凝土枕螺栓孔縱裂原因進(jìn)行分析，提出局部特殊混凝土改進(jìn)的思路。 返回 longitudinal sleeper