[判断题]遇下列情况之一，禁止跟踪出站调车：先发列车需由区间返回，或挂-我要搜题网

[单选题]互换性几何参数内容包括尺寸、形状和(　　)
A.强度
B.硬度
C.位置
D.材料

[单选题]当飞机没有交流电源，电瓶电门ON位，APU控制电门ON位时：
A.由APU直流泵从左主油箱向APU供油
B.由APU直流泵从右主油箱向APU供油
C.由左前增压泵从左主油箱向APU供油
D.由超控泵从中央油箱向APU供油

[单项选择]地震灾害的伤亡主要由（　）造成。
A. 建筑物倒塌和地面破坏
B. 地震余波
C. 地震引起的火灾
D. 地震恐慌

[不定项选择题]共用题干 More Than 8 Hours Sleep Too Much of a Good Thing
1 Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
2 Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling re-freshed after a night's sleep than 8-hour sleepers.
3 These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night.He added that“it might be a good idea” for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cau-tioned that more research is needed to confirm this.
4 Previous studies have shown the potential dangers of chronic shortages of sleep一for instance,one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
5 For the current report,Kripke reviewed the responses of 1,004 adults to sleep ques-tionaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems. Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
6 Kripke found that people who slept between 9 and 10 hours each night were more like-ly to report experiencing each sleep problem than people who slept 8 hours. In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed.“It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake.”he said. Paragraph 2______
A.Kripke's Research
B.Dangers of Habitual Shortages of Sleep
C.Criticism on Kripke's Report
D.A way of Overcoming Insomnia
E.Sleep Problems of Long and Short Sleepers
F.Classification of Sleep Problems

[判断题]遇下列情况之一，禁止跟踪出站调车：先发列车需由区间返回，或挂有由区间返回的后部补机；A.正确B.错误

热门试题:

[判断题]遇下列情况之一，禁止跟踪出站调车：先发列车需由区间返回，或挂有由区间返回的后部补机；
A.正确
B.错误