皮皮学,免费搜题
登录
搜题
【简答题】
Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing w ill turn slow and become quite regular. Your brain waves slow down a bit too, with the alpha - rhythm of rather fast waves predominating for the first few minutes. This is called stage 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep, the slower your brain waves will be. Then about 40 to 60 minutes after you lose consciousness you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta - rhythm. This is stage 4 sleep. You do not remain at this deep fourth stage all night long, but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta-rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. D uring REM sleep period , your body will soon relax again, your breathing will grow slow and regular once more, and you will slip gently back from stage 1 to stage 4 sleep — only to rise once again to the surface of near consciousness some 80 minutes later.
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【判断题】“城门失火,殃及池鱼”体现了事物之间的普遍联系 。 A 正确 B错误
A.
正确
B.
错误
【简答题】William: Goodafternoon, how is it going? Lin: Goodafternoon, I’m fine. What about you? William: Nothingnew. Where are you 1 ) ____________now? Lin: I am going toplay basketball with my friends. Would ...
【判断题】在供应链环境下,信息传递一般是从底层向高层反馈,形成和组织结构平行的层次性信息传递模式。
A.
正确
B.
错误
【单选题】电子商务平台经营者,是指在电子商务中为交易双方或者多方提供网络经营场所、交易撮合、信息发布等服务,供交易双方或者多方独立开展交易活动的( )。
A.
法人
B.
非法人组织
C.
法人或者非法人组织
D.
自然人
【判断题】在供应链环境下,谢谢传递一般是从底层向高层反馈,形成和组织结构平行的层次性信息传递模式
A.
正确
B.
错误
【判断题】160~200km/h区段,非绝缘锚段关节采用四跨形式。
A.
正确
B.
错误
【单选题】电子商务平台经营者,是指在电子商务中为交易双方或者多方提供网络经营场所、交易撮合、信息发布等服务,供交易双方或者多方独立开展交易活动的( )。
A.
法人或者非法人组织
B.
法人
C.
非法人组织
D.
自然人
【简答题】听句子,选出相应的答语 (     )1. A.Good morning. (     )2. A.How are you? (     )3. A.He is my brother. (     )4. A.He is over there. (     )5. A.Yes, I am. B. Good afternoon. B. How do you do? B. She is my sist...
【单选题】预算就是对计划进行
A.
明确化
B.
清晰化
C.
数字化
D.
选择化
【单选题】下列各项中,制造企业应确认为无形资产的是( )。
A.
自创的商誉
B.
企业合并产生的商誉
C.
内部研究开发项目研究阶段发生的支出
D.
以纳土地出让金方式取得的土地使用权
相关题目: