第21题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. English settlers. B. Native farmers, herdsmen and hunters. C. Missionaries, civil servants and professional people. D. German settlers. 参考答案:B 答案解析:[听力原文] 26-28
Kenya was a beautiful country inhabited by different groups of people, some farmers
第31题: [单项选择]低熔烤瓷材料的熔点范围在 A. 1200~1450℃ B. 850~1050℃ C. <500℃ D. 1050~1200℃ E. 500~850℃ 参考答案:B 答案解析:烤瓷材料根据不同熔点范围分为三类:高熔烤瓷材料1200~1450℃;中熔烤瓷材料1050~1200℃;低熔烤瓷材料850~1050℃。按材料的成分和性质又分为:长石质烤瓷和氧化铝质烤瓷。