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暗色未反应保护渣层
met.
dark unreacted powder layer
(【技】即通常所说的粉渣层,位于结晶器内保护渣三层结构的最上层,温度低、颜色暗、呈粉状、尚未与钢水起反应,故由此得名。)
;
layer of dark unreacted powder
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