判断题
正确(↓↓↓ 点击‘点击查看答案’看答案解析 ↓↓↓)
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/...
单项选择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。
支持附件主要包括应急救援有关支持保障系统的描述及所附相关图表。 ...
判断题支持附件主要包括应急救援有关支持保障系统的描述及所附相关图表。 正确 错误
Cats are creatures of habit．They like to go to sleep ab...
单项选择题Cats are creatures of habit．They like to go to sleep about the same time every day and for a certain length of time．They seem to have a natural clock inside them that tells them when to sleep． Cats increase their regular sleep with occasional cat naps (打盹)．Some experts feel that humans could also benefit from this habit．Cat naps help to build up energy in the body．They are also a good way to get rid of trouble! Since cats have the same moods(情绪) as humans, some experts believe that people can improve their moods．People might become happier． A number of famous people have copied cats by taking cat naps during the day．The naps would usually last from 15 to 30 minutes． Winston Churchill took cat naps．So did Presidents Harry Truman, John F．Kennedy and Lyndon B．Johnson．These famous men were known for their energy．They were also able to work long hours, often into the night．Napping was their secret． Perhaps more people learn from cats and take naps to feel better and live longer! Naps usually last_______．
