通常数字调制后的码元速率()编码前。 A.大于 B.等于 C.小于 D.以上都有可能

题型:单项选择题

问题:

通常数字调制后的码元速率()编码前。

A.大于

B.等于

C.小于

D.以上都有可能

考点:民航电信人员执照考试数字通信数字通信题库
题型:单项选择题

建议青春期男孩不穿紧身衣裤是为了()。

A.保护皮肤

B.促进生长

C.防止频繁遗精

D.保持生殖系统

E.以上都不是

题型:单项选择题

盈利目标是通过( )比较求得的。

A.销售收入和销售量

B.销售量与固定成本

C.固定成本与销售总成本

D.销售总成本与销售收入

题型:单项选择题

Part 2


Questions 9-18


·Read the following article and answer questions 9-18 on the next page.

Train Your Body into Knowing When It’s Time to Sleep


1. A good night’s sleep actually starts in the morning. The second your eyes open, light shoots down the optic nerve and into the brain’s biological clock. There it stimulates the production of hormones that regulate growth, reproduction, eating, sleeping, thinking, remembering—even how you feel from minute to minute. "Sunlight activates the brain," says Frisca L. Yan-Go, M.D., medical director of the UCLA Sleep Disorders Center. And activating it at the same time every morning synchronizes your body’s biological clock. Then your body has a clear direction that at midnight it’s supposed to be asleep and at noon it’s supposed to be awake. Wake up at a different time every day and the clock is out of order. You feel sleepy and hung over for hours, and even when you start to feel a bit more alert after that first Starbucks (星巴克) , you really never achieve the mental edge of what you’re capable.
2. Shall we go to bed when feeling tired No, not just tired. Sleepy, as your eyes are tired and you keep losing track of what people are saying to you.
3. Sleeping from 11:30 P.M. until 2:00
  • A.M., tossing and tuning until 4, then sleeping until 6 gives you eight hours in bed but only four and a half hours of sleep. That’s a huge mismatch that can actually inhibit your sleep drive and cause insomnia all by itself. To prevent that from worsening your sleep issues, when you wake at 2:00A.M., get up and go to read a book in the living room. Being up increases your sleep drive—which just could make you sleepy enough to actually fall asleep when you return to bed. Caution: Don’t stay in bed when you’re awake. A part of your mind will begin to associate the bed with being awake rather than being asleep. And that can turn on a nasty "I’m-not-going-to-sleep!" anxiety that will speed up your engines whenever you get into bed. It’s one of the causes of chronic insomnia.
    4. You need one hour before bed to wind down and get transition from the woman-who-can-do-everything into the woman-who-can-sleep. Unfortunately, most women are not giving themselves one single second. According to the 2007 National Sleep Foundation poll, during the hour before bed, around 60 percent of us do household chores, 37 percent take care of children, 36 percent do activities with other family members, 36 percent are on the Internet, and 21 percent do work related to their jobs.
    5. Staying up late on Friday and Saturday nights and getting up late on Saturday and Sunday mornings is frequently the gift we give ourselves on weekends after a hard week at work. Yet that little gift—small as it is—is enough to screw up our biological clocks. Even if you get to bed early on Sunday night, you will not be ready to sleep, and you will not end up being the happy camper Monday morning.

    Questions 9-13


    ·For questions 9-13, choose from the list A-G which best summarize each part of the article.
    ·For each numberedparagraph (1-5), mark on letter (A-G) on the Answer Sheet.
    ·Do not mark any letter twice.A. Do household chores before bed
  • B. Hit the sheets only when sleepy
  • C. Stay up late only on Saturday nights
  • D. Give yourself an hour before bed
  • E. Wake up at the same time every day
  • F. Beware of Sunday night insomnia
  • G. Get up when awake

Paragraph 5 ______

题型:单项选择题

社会工作者程述为了促进社会公正,可以从()等方面介入社会生活,对不公正现象进行干预。

A.修复社会的机制,解决和预防社会问题

B.为困难群体提供帮助,增强他们参与社会生活的能力

C.促进不公正制度的改变

D.帮助服务对象增强自身功能

E.为困难群体、弱势群体参与社会生活提供更多的机会和制度保障

题型:单项选择题

礼仪的基本职能有()、沟通信息、联络感情、增进友谊

A、塑造形象

B、服务到位

C、真诚真挚

D、社会稳定

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