日本在2011年3月11日发生了九级地震,造成了严重的核泄漏.继3月26、27日

题型:问答题

问题:

日本在2011年3月11日发生了九级地震,造成了严重的核泄漏.继3月26、27日在黑龙江省东北部监测点的气溶胶样品中检测到了极微量的人工放射性核素碘-131之后,28日,中国东南沿海江苏省、上海市、浙江省、安徽省、广东省、广西壮族自治区部分地区的监测点气溶胶样品中也检测到了极微量的人工放射性核素碘-131.这引发了人们对核能利用安全问题的思考.相对核电站来说水电站安全环保.有某一水电站发电机组设计为:水以v1=3m/s的速度流入水轮机后以v2=1m/s的速度流出,流出水位比流入的水位低100m,水流量为Q=100m3/s,水轮机效率为75%,发电机效率为80%,求:(g=10m/s2,水的密度ρ=103 kg/m3

(1)发电机组的输出功率是多少?

(2)如果发电机输出电压为24kV,输电线路中能量损失为0.05%,输电线电阻为19.5Ω,那么所需升压变压器的原、副线圈匝数比是多少?

考点:重力势能远距离输电的相关计算能量守恒定律、第一类永动机
题型:问答题

今年1月10日以来的低温雨雪冰冻,造成全国19个省(市、自治区)发生不同程度的灾害,直接经济损失已达到了537.9亿元,537.9亿元用科学记数法表示为(  )[ ]

A.5.379×10亿元

B.5.379×102亿元

C.5.379×103亿元

D.5.379×104亿元

题型:问答题

Few of us haven't read Cinderella, the story of a young woman living in poverty who meets the prince of her dreams, Some might not want to admit it, but there is a hidden Cinderella in everyone's heart—we all wish we could achieve recognition or success after a period of obscurity(默默无闻) or neglect.

Mary Santiago has that secret dream, too.Her story is featured in Another Cinderella Story, a film set in a US high Mary is shy but loves to dance.Compared with other girls, she is invisible.However, her world changes completely when a famous teenage pop singer, Joey Parker, appears.

Joey is everything the rest of the boys in her class are not—kind, handsome and desirable.Mary and Joey's paths cross at a ball.They meet and falHn love with each other.But when Mary has to.rush back home, she leaves behind her MP3 player, which becomes the only clue Joey has to find the girl of his dreams.Of course, there is a wicked(邪恶的) stepmother, who turns out to be Dominique Blatt and she takes in Mary after her dancer mother dies.Dominique treats Mary like a maid and does everything she can to make sure Mary doesn't get into the top dance school.Her two daughters are equally determined to stop Joey falling for Mary, even if that means embarrassing her.

The story, though it mostly follows Cinderella, does add a few modem day twists to the classic fairy tale.Refreshingly, the film, unlike many high school films, does not focus on looks, although the actors are all beautiful.There is also a lot less materialism in Another Cinderella Story than in many similar movies.

"The movie takes the Cinderella fairytale as its jumping off point," writes movie critic Amber Wilkinson."The focus is firmly on following your dream."

小题1:The first paragraph is mainly to _____.

A.build interest and lead us to Mary's secret dream

B.remind us why Cinderella is popular all the years

C.inform us of the main topic of the whole passage

D.tell us how interesting the fairy tale Cinderella is小题2:In the movie, Mary Santiago is the main character who     .

A.is brave in expressing her iove

B.is attended badly by the stepmother

C.has a dream of meeting a prince

D.is embarrassed by the pop singer小题3:What can we infer from the passage?

A.Joey is just like other boys in Mary's class.

B.Mary's mother influences her a lot m singing.

C.Not many people have a dream to be realized.

D.The MP3 player helps Joey in finding Mary.小题4:The passage is mainly _____.

A.an introduction to a film

B.a review about a film

C.an essay about dreams

D.an advertisement of Cinderella小题5:According to the passage.Another Cinderella Story _____.

A.follows Cinderella with nothing new

B.pays more attention to the looks of the actors

C.encourages young people to follow their dreams

D.focuses more on materialism than other films

题型:问答题

软件生命周期分为软件定义期、软件开发期和软件维护期,详细设计属于______中的一个阶段。

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凡具备国家教育行政主管部门认可的中专以上(含中专)会计类专业学历的人员,均可免试部分会计从业资格考试科目。 ( )

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男性,24岁,右示指中、末节掌侧切削伤6小时,局部软组织缺损1cm×2cm,肌腱外露,急诊清创后应采用()

A.直接缝合皮肤

B.凡士林纱布覆盖包扎

C.中厚游离皮片移植

D.邻指带蒂皮瓣

E.腹股沟轴型皮瓣

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