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alternating single/double-roll pattern
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met.
单环流/ 双环流交替变化模式
(【技】指由于拉坯速度、喷吹气体、浸人式水口侧孔倾角及堵塞状况等因素变化所引起的结晶器内钢水的单/双环流交替变化的流动模式。)
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