缩孔和缩松是球墨铸铁特有的废品现象.Shrinkage and dispersed shrinkage are the special waster of ductile iron.分析了缩孔产生的原因,消泡剂的作用机理并介绍了预防缩孔的措施.The reasons of crater and action mechanisms of antifoaming agents were analysized.取消冷冒口后,缩孔、缩松问题成功...
The stages in her love affair with Harry are perceptively written.她和哈里恋爱的各阶段写得非常细腻深刻。Tom's love affair with France and most things French knew no bounds.汤姆对法国和大多数法国东西都无比热爱。the English love affair with gardening英格兰人对...