第6题: [单项选择]一组混凝土试块的强度数据分别为48.0MPa、40.2MPa、52.4MPa,则该组试块强度值应为( )MPa。 A. 46.7 B. 48.0 C. 46.9 D. 46.8 参考答案:B 答案解析:[解析] 试验结果的数据处理:无论是抗压强度还是抗折强度,试验结果均以3个试件的算术平均值作为测定值。如任一个测定值与中值的差超过中值的15%,取中值为测定结果;如两个测定值与中值的差都超过15%时,
第26题: [单项选择]Questions 19 to 21 are based on the conversation you have just heard. A. To give travel information to passengers. B. To know his way around the city very well. C. To spend a lot of time waiting at stations. D. To predict where he can pick up a passenger. 参考答案:D 答案解析:[听力原文] What does the man need to do as a taxi driver