第3题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. Mary is going to Hawaii. B. Mary has bean to many countries. C. Mary likes postcards. D. Mary is traveling on business. 参考答案:C 答案解析:[听力原文] W: I guess I’ll send Mary a postcard from Hawaii when I go there on business. M: I’m su
第15题:[单选题]某隧道一段区域内最低亮度为52cd/m2,该区域平均亮度为60cd/m2;隧道路面中线上的最大亮度为72cd/m2,最小亮度为55cd/m2。结合上述内容,回答下列问题。(5)我国规范规定,当烟雾浓度达到()时,应采取交通管制。 A. 0.1m-1 B. 0.012m-1 C. 0.025m-1 D. 0.050m-1 参考答案:B 2020教材545页,(5)当烟尘浓度达到0.012m-1时,应采取交通管制等措施。