宇宙间任何两个物体,大到天体,小到灰尘之间,都存在互相吸引的力,这就是_____

题型:填空题

问题:

宇宙间任何两个物体,大到天体,小到灰尘之间,都存在互相吸引的力,这就是_________。地球同步卫 星与地球之间________(填“存在”或“不存在”)这种力。

考点:万有引力
题型:填空题

已知关于x的一元二次方程x2+bx-2=0的一个根为1,则它的另一根为______.

题型:填空题

阅读理解。

     My parents influenced us with the concepts of family,faith and patriotism when I was

young.Even though we struggled to make ends meet,they stressed how fortunate we were

to live in a great country with limitless opportunities.

     I got my first real job when I was ten.My dad,Benjamin,injured his back working in a

cardboardbox factory and was retrained as a hairstylist.He rented space in a little mall

 and gave his shop the fancy name of Mr Ben's Coiffure.

     The owner of the shopping center gave Dad a discount on his rent for cleaning the

parking lot three nights a week,which meant getting up at 3 am.To pick up trash,Dad

used a little machine that looked like a lawn mower.Mom and I emptied garbage cans

and picked up litter by hand.It took two to three hours to clean the lot.I'd sleep in the

car on the way home.

     I did this for two years,but the lessons I learned have lasted a lifetime.I acquired

discipline and a strong work morality,and learned at an early age the importance of

balancing life's competing interests-in my case,school,homework and a job.This really

helped during my senior year of high school,when I worked 40 hours a week flipping

hamburgers at a fastfood joint while taking a full load of collegeprep courses.

     The_hard_work_paid_off.I attended the US Military Academy and went on to

receive graduate degrees in law and business from Harvard.Later,I joined a big Los

Angeles law firm and was elected to the California state assembly.In these jobs and in

everything else I've done,I have never forgotten those nights in the parking lot.The

experience taught me that there is dignity in all work and that if people are working to

provide for themselves and their families,that is something we should honor.

1.According to the text,the author thinks________.

A.he is lucky to have many chances to get a job

B.it is difficult to find a job to make ends meet

C.his parents are full of complaint about their life

D.it is not acceptable to live in such bad conditions

2.In order to get a discount on rent,________.

A.his father had to work as a hairstylist

B.his father had to work in a cardboardbox factory

C.they had to clean the parking lot three nights a week

D.his father had to pick up litter by hand three hours a day

3.Which of the following is NOT true of the author?

A.He got the graduate degrees from Harvard.

B.He took a collegeprep courses at high school.

C.He took a parttime job during his senior year.

D.He regretted having worked in the parking lot.

4.What does the underlined sentence "The hard work paid off" mean?

A.The author got a high pay by working hard.

B.The author complained of the hard work.

C.The effort which he made had no effection.

D.The hard work was worthwhile for the author.

5.We can learn from the text that________.

A.it is unimaginable for a child to help his family

B.it is honored to work for one's family as a member

C.it is unnecessary to keep work rules of behaviour

D.the harder the work is,the more interest one shows

题型:填空题

充足的睡眠对健康很有益处,成人每天需要几小时睡眠()

A、5-6小时

B、7-8小时

C、9-10小时

D、11-12小时

题型:填空题

结构化系统分析和设计的主导原则是()

A.自底向上

B.集中

C.自顶向下

D.分散平行

题型:填空题

简述网络文件系统NFS,并说明其作用。

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