中立位，均衡风缸漏风会引起制动管压力（）。A、上升； B、下降； C、不变； D、过

发布时间：2017-07-28 02:39 │ 来源：www.tikuol.com

题型：单项选择题

问题：

中立位，均衡风缸漏风会引起制动管压力（）。

A、上升；

B、下降；

C、不变；

D、过量供给

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以下说法正确的有（）。

A.两种完全正相关证券组合的结合线为一条直线

B.两种完全负相关证券组合的结合线为一条折线

C.相关系数ρAB的值越大，弯曲程度越低

D.相关系数ρAB的值越大，弯曲程度越高

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某实验小组同学用打点计时器测量匀加速直线运动的小车运动的加速度，下图为实验中获取的一条纸带的一部分，0、1、2、3、4、5、6是计数点，每相邻两计数点间还有3个打点（图中未标出），计数点间的距离如图所示．

如果相邻两个计数点之间的距离分别用x₁、x₂、x₃、x₄、x₅、x₆表示，打点时间间隔用T表示，请写出加速度的表达式a ="_______"

（2）根据图中数据计算小车运动的加速度大小a =_______m/s²。（计算结果保留三位有效数字)．

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完形填空

      When I was 15, I announced to my English class that I was going to write my own books. All the
students nearly fell out of their chairs, ___1___me. "Don't be ___2___. Only geniuses (天才) can become
writers," the English teacher said sarcastically(讽刺地). "And you are getting a D this term." I was ___3___
deeply and I burst into tears.
      That night I wrote a short, sad poem about ___4___ dreams and mailed it to the Capper's Weekly
newspaper. To my ___5___, they published it, and sent me two dollars. I was a(an)___6___ writer! I
showed my teacher and fellow students. They laughed again. "Just plain dumb luck,(纯属侥幸)" the teacher said. However, I'd tasted ___7___. I'd sold the first thing I'd ever written.
      By the time I graduated from high school(with a C-minus average), I had scrapbooks filled with my
published ___8___. I never talked about my writing to my ___9___, friends or my family again. They were
___10___ killers, and if people must choose between their friends and their dreams, they must always
choose their dreams.
     Later, I wrote a book about what I understood and ___11___ about life. It took me nine months, just
like a(an)___12__. I chose a publisher and wrote a letter, which ___13___: "I wrote this book myself, I
___14__ you like it. Chapters(章节) 6 and 12 are my___15___. Thank you." I mailed it without an
envelope.
     A month later, I___16___a letter, and a request to start working on___17___book. Crying Wind
became a bestseller, and was translated into 15 languages. People ask what college I attended, what
degrees I have, and what qualifications(品质) I have to be a writer. The answer is ___18___. I just write. I'm not a genius, and I'm not gifted. I just write. To all those who dream of___19___, I'm shouting at you, "Yes, you___20__! Don't listen to them!"  Writing is easy. It's fun, and anyone can do it.

( )1. A. listening to
( )2. A. silly
( )3. A. hurt
( )4. A. strange
( )5. A. regret
( )6. A. welcomed
( )7. A. success
( )8. A. poems
( )9. A. parents
( )10. A. time
( )11. A. did
( )12. A. baby
( )13. A. wrote
( )14. A. demand
( )15. A. explanations
( )16. A. accepted
( )17. A. others
( )18. A. many
( )19. A. success
( )20. A. must

B. talking about
B. discouraged
B. cheated
B. unusual
B. surprise
B. paid
B. failure
B. works
B. headmasters
B. hobby
B. saw
B. plant
B. read
B. think
B. favourites
B. received
B. the other
B. none
B. being famous
B. can

C. laughing at
C. shy
C. struck
C. beautiful
C. joy
C. honored
C. luck
C. letters
C. publishers
C. thought
C. heard
C. animal
C. showed
C. hope
C. dreams
C. signed
C. other
C. some
C. writing
C. need

D. looking at
D. pride
D. hit
D. broken
D. disappointment
D. educated
D. pain
D. jokes
D. teachers
D. dream
D. felt
D. boy
D. told
D. suggest
D. reasons
D. kept
D. another
D. few
D. being rich
D. should

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题型：单项选择题

晶状体前面的曲率半径约（）mm，后面约为（）mm。

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题型：单项选择题

邮政支局要履行好的三大义务包括：（）、邮件验视义务、现场管理义务。

A.告知义务

B.遵守法律的义务

C.合规经营的义务

D.按照内部规范办理业务的义务

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