第2题: [单项选择]下列耐火材料中,属于中性耐火材料的是( )。 A. 高铝砖 B. 镁铝砖 C. 硅砖 D. 白云石砖 参考答案:A 答案解析:解析:耐火材料按化学特性分类分为:酸性耐火材料、碱性耐火材料和中性耐火材料。
中性耐火材料是指以三氧化二铝、三氧化二铬和碳为主要成分的耐火材料。如刚玉砖、高铝砖、碳砖等。其特性是对酸性渣和碱
第9题: [单项选择]Passage One
Questions 26 to 29 are based on the passage you have just heard. A. She is not good at making friends. B. She is not well off. C. She enjoys company. D. She likes to go to concerts alone. 参考答案:B