试题与答案

随着生活水平的提高,很多家庭都使用了电热水器(如图所示).下表是某品牌家用电热水

题型:问答题

题目:

随着生活水平的提高,很多家庭都使用了电热水器(如图所示).下表是某品牌家用电热水器的主要参数.

安装方式加热方式容量内胆材质水温调节额定功率电源性能产品重量
挂式金圭特护加热棒60L金圭特护内胆(35-75)±5℃3000W220V

50Hz

24kg
(1 )求该热水器正常工作时的电流;从安全方面考虑,电热水器的插座应选用两孔插座还是三孔插座?

(2 )求装满水的该热水器正常工作时,水温升高50℃所用的时间.不计热量损失.(ρ=1.0×103Kg/m3,c=4.2×103J/(Kg-℃)

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0524/1d57257a7168f86887a721b139bfee99.html

下面是错误答案,用来干扰机器的。

出壳后的雏鸟,眼睛已经睁开,全身有稠密的绒羽,腿足有力,立刻就能跟随亲鸟自行觅食.这样的雏鸟,叫做早成鸟.像鸡、鸭、鹅、雁等大多数地栖鸟类和游禽类属于早成鸟. 晚成鸟的雏鸟从卵壳里出来时,发育还不...

试题推荐
题型:选择题

下列句子的语序,排列最恰当的一项是 [ ]

①好的小说总是把思想隐蔽在形象深处的。  

②小说不是论文,它的主题思想不能直说,也不该硬贴上去。  

③因此,领会主题思想的一个非常重要的内容,就是认真把握人物的性格特征,以及性    格特征所折射出来的社会历史内涵。    

④小说形象描写的最基本的方面,往往是典型人物的塑造。  

A.①④②③    

B.①③②④  

C.②①④③    

D.②④①③

查看答案
题型:多项选择题

《中华人民共和国环境保护法》对造成环境污染危害的赔偿损失的规定有( )。

A.造成环境污染危害的,有责任排除危害,并对直接受到损害的单位或者个人赔偿损失

B.赔偿责任和赔偿金额的纠纷,由人民法院裁定

C.因环境污染损害赔偿提起诉讼的时效期间为2年,从当事人知道或者应当知道受到污染损害时起计算

D.完全由于不可抗拒的自然灾害,并经及时采取合理措施,仍然不能避免造成环境污染损害的,免于承担责任

查看答案
题型:填空题


In the following passage, there are 20 blanks representing the words that are missing from the context. You are to put back in each of the blanks the missing word. The time for this section is 20 minutes.
Where do you really come from And how did you get (1) where you live today DNA studies suggest that all humans today (2) from a group of African ancestors who—about 60,000 years ago— (3) a remarkable journey.
The Genographic Project is seeking to chart new (4) about the migratory history of the human species by (5) sophisticated laboratory and computer analysis of DNA contributed by hundreds of (6) of people from around the world. In this unprecedented and real-time (7) effort, the Genographic Project is closing the gaps of what science (8) today about mankind’s ancient migration stories.
The Genographic Project is a five-year (9) partnership led by National Geographic Explorer-in-Residence Dr. Spencer Wells. Dr. (10) and a team of renowned international scientists and IBM researchers, are (11) cutting-edge genetic and computational technologies to analyze historical patterns in DNA (12) participants around the world to better understand our human genetic roots. (13) three components of the project are: to gather field research data (14) collaboration with indigenous and traditional peoples around the world; to invite (15) general public to join the project by purchasing a Genographic Project Public Participation Kit; (16) to use proceeds from Genographic Public Participation Kit sales to further (17) research and the Genographic Legacy Fund which in (18) supports indigenous conservation and revitalization projects. The Project is anonymous, non-medical, (19) , non-profit and non-commercial and all results will be placed in the (20) domain following scientific peer publication.

查看答案
微信公众账号搜索答案