A.真空時(shí)間不夠B.軟吹時(shí)間不足C.敞開(kāi)澆注D.劃傷坯、接頭坯、波動(dòng)坯等
A.足量B.渣面全覆蓋C.不發(fā)紅D.微微波動(dòng)
A.引流砂名稱B.料號(hào)C.批號(hào)D.領(lǐng)用數(shù)量