【Key words】 ROKOP billet continuous casting ; high casting sped; secondary cooling; middle crack.
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crack in middle bent edge 折边中间裂缝
When applied high frequency pulse current on CC. billet, the centerline pipe and centerline crack in billet are eliminated, and the central segregation and middle crack are improved.
用高频电场处理连铸小方坯，可以消除铸坯中心缩孔和中心裂纹。改善中心偏析和中间裂纹。
As more high schools begin teaching it, the door could crack open for middle schools, and, perhaps inevitably, elementary schools, to incorporate a truly more multicultural curriculum.
随着更多的高中开始教授多元文化课程，中学可能也会对其敞开大门，并且小学也可能不可避免地将其纳入课程设置中，真正教授更具多元文化的课程。
To crack the upper echelons of corporate America, McKinsey said companies must groom a deeper bench of female middle managers for advancement.
麦肯锡称，要想实现公司上层管理梯队的性别多样化，美国公司必须预先培养数量更庞大的女性中层管理人员。
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