A.1250 B.1350 C.1450 D.1550
A.2~3 B.3~4 C.4~5 D.5~6
A.1460B.1500C.1540D.1580
A.硅砖 B.高铝砖 C.轻质耐火砖 D.铸铁砖
A.98% B.98.5% C.99% D.99.5%
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