单项选择题
A.1.5~2.0% B.2.0% C.0.5% D.1.5%
A.1630~1850 B.1680~1900 C.1570~1890 D.1550~1780
A.0.5~0.8 B.0.4~0.6 C.0.25~0.30 D.0.45~0.55
A.中性耐火材料 B.非氧化物耐火材料 C.碱性耐火材料 D.酸性耐火材料
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