蜡烛燃烧后生成二氧化碳和水,下列说法正确的是[ ] A、蜡烛燃烧前后质量不变 B

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问题:

蜡烛燃烧后生成二氧化碳和水,下列说法正确的是[ ]

A、蜡烛燃烧前后质量不变

B、蜡烛减少的质量等于生成二氧化碳和水的质量

C、蜡烛燃烧后生成物的质量之和等于蜡烛减少的质量与消耗氧气的质量之和

D、燃烧前蜡烛的质量加上消耗氧气的质量等于剩余蜡烛的质量与生成的二氧化碳和水的质量之和

考点:质量守恒定律
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阴虚血热,冲任不固的崩漏、月经过多,宜首选()。

A.龟甲

B.鳖甲

C.石斛

D.天冬

E.麦冬

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根据风险管理理论,风险管理的主体包括()等。

A.损失

B.风险

C.家庭

D.合同

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某医生采用DDST在社区人群中筛查智力低下患儿,200名DDST阳性者中最终确诊者80名,另在200名DDST阴性者中发现2名智力低下患儿,请依据以上资料对DDST筛查儿童智力低下的真实性进行评价。 2. 某学者在社区人群中进行了病例对照研究,以分析吸烟与肺癌的关系。选择700例肺癌患者为病例组,并随机选择1000例正常人作为对照组。肺癌患者中500例有吸烟史,而对照者有450例有吸烟史。 问题:

若要排除该OR值由抽样误差引起的可能性,应做何分析?

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阅读理解。

      I was interested to read a newspaper article about a new concept in old people's homes

in France. The idea is simple,but revolutionary-combining a residential home for the elderly

with a nursery school in the same building. The children and the residents eat lunch together

and share activities. In the afternoons,the residents enjoy reading or telling stories to the

children,and if a child is feeling sad or tired,there is always a kind lap to sit on and a cuddle.

There are trips out and birthday parties,too.

      The advantages are enormous for everyone concerned. The children are happy because

they get a lot more individual attention,and respond well because someone has time for

them. They see illness and death and learn to accept them. The residents are happy because

they feel useful and needed. They are more active and more interested in life when the

children are around and they take more interest in their appearance,too.

     Nowadays there is less and less contact between the old and the young. There are many

reasons for this,including the breakdown of the extended family,working parents with no

time to care for ageing relations,families that have moved away,and smaller flats with no

room for grandparents. But the result is the same-increasing numbers of children without

grandparents and old people who have no contact with children. And more old people

who are lonely and feel useless,along with more and more families with young children

who desperately need more support. It's a major problem in many societies.

     That's why intergenerational_programmes,designed to bring the old and the young

together,are growing in popularity all over the world. There are examples of successful

attempts all over the world. Using young people to teach IT skills to older people is one

obvious example. Using old people as volunteer assistants in schools is another,perhaps

reading with children who need extra attention.

1.Anurseryschoolisaplacewhere_______.

A.futurenursesaretrained

B.theelderlylive

C.childrenaretakencareof

D.theoldjoininactivities

2.Whichistrueaccordingtothepassage? ______

A.Anumberofassistantsareemployedtotakecareofthechildren.

B.Thenewconceptbenefitsboththeelderlyandthechildren.

C.Thechildrenbecomestrongeraftergettingmoreindividualattention.

D.Thechildrenlearnthatsickpeoplewilldie.

3.WhatismainlytalkedaboutinParagraph3?______

A.Thereasonwhytheoldandtheyoungareseparated.

B.Onereasonwhychildrendon'tlivewiththeirgrandparents.

C.Thesupportchildrenneed.

D.Theproblemthattheoldandtheyoungareseparated.

4.Whatdoesthe"intergenerationalprogrammes"inParagraph4referto? ______

A.Combiningelderlyhomeswithnurseryschools.

B.Lettingthechildrenandtheresidentseattogether.

C.AskingyoungpeopletoteachITskillstoolderpeople.

D.Usingoldpeopleasvolunteerassistantsinschools.

5.Whatisthebesttitleforthepassage? ______

A.Oldpeople'shomesinFrance

B.Buildingbridgesoflife

C.Asolutiontotheelderlyproblem

D.Children'snewhappylife

题型:不定项选择题

用竞争性谈判方式采购的,采购人从谈判小组提出的成交候选人中根据符合采购需求、质量和服务相等且()的原则确定成交供应商。(38条)

A、报价最低

B、报价适中

C、报价合理

D、性价比最高

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