感染转为慢性结局的主要原因是（） A.机体抵抗力与细菌毒力处于相持状态 B.细菌毒力 发布时间：2017-06-09 10:06 │ 来源：www.tikuol.com 题型：单项选择题 A1/A2型题 问题： 感染转为慢性结局的主要原因是（）A.机体抵抗力与细菌毒力处于相持状态B.细菌毒力增大C.人体抵抗力下降D.治疗不当E.致病菌发病时间较长
题型：单项选择题 A1/A2型题 任务型阅读。从方框中选择恰当的句子补全短文。 Did you sleep all day on March 21? 1 This is the day of the year when people around the world care about their sleep and ask themselves a lot of questions about sleep. Why do we need sleep? 2 However, tests have shown that a lack(缺乏) of sleep for over four weeks may cause a strong drop of body temperature, great weight loss, and finally sickness. 3 Eight hours a night is the average amount of sleep people need. Primary schoolstudents need to sleep for about ten hours. Junior high school students should sleep for about ninehours and senior high school students should sleep for about eight hours. 4 Thomas Edison said that sleep was a waste of time. He didn't sleep during the night. But he took naps (小睡;打盹) during the day. On the other hand, 5 A. Nobody can answer this question well. B. Different people need different amounts of sleep. C. Albert Einstein said he needed to sleep for at least ten hours a night. D. There are so many people that do not care about their sleep. E. You should have done so because it was World Sleeping Day. 查看答案
题型：单项选择题 A1/A2型题 有关恒流与恒压充电的对比，以下哪种描述正确？（）。A.恒压充电常用于电池在车间长时间充电，而恒流充电常用于满足快速充电的要求B.铅酸电池常用恒流充电而镍镉电池常用恒压充电方法C.恒流充电常用于电池在车间长时间充电，而恒压充电常用于满足快速充电的要求D.恒流充电无法将电池充满，而恒压充电可以 查看答案