如果用平面截掉一个长方体的一个角,剩下的几何体有几个顶点、几条棱、几个面?

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问题:

如果用平面截掉一个长方体的一个角,剩下的几何体有几个顶点、几条棱、几个面?

考点:点、线、面、体
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图甲是在温度为10℃左右的环境中工作的某自动恒温箱原理简图,箱内的电阻R1="20" kΩ,R2 ="10" kΩ,R3 ="40" kΩ,Rt为热敏电阻,它的电阻随温度变化的图线如图乙所示.当a、b端电压Uab ≤ 0时,电压鉴别器会令开关S接通,恒温箱内的电热丝发热,使箱内温度升高;当a、b端电压Uab>0时,电压鉴别器会令开关S断开,停止加热,则恒温箱内的温度可保持在(   )

A.10℃

B.20℃

C.35℃

D.45℃

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冻肉出冷库后比进冷库时重,这是为什么?

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基于项目投资假设,将企业的全部资金作为自有资金对待,在确定项目总投资时不需要考虑借款利息。( )

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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 1 ______

题型:解答题

下列关于试用期的表述,正确的是( )。

A.劳动合同期限3个月以上不满1年的,试用期不得超过1个月

B.劳动合同期限1年以上不满3年的,试用期不得超过2个月

C.无固定期限的劳动合同,试用期不得超过3个月

D.3年以上固定期限的劳动合同,试用期不得超过6个月

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