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流钢孔向下角度
met. down port angle (浸人式水口的); downward outlet angle (浸人式水口的); downward port angle (浸人式水口的: The submerged entry nozzle is a conventional dual rectangular port design with downward port angles of 15 degrees. 该浸人式水口系普通双矩形流钢孔结构,流钢孔下倾角为15。。)