一组数据各个偏差的平方和的大小,与数据本身有关,但与数据的容量无关。( )

题型:判断题

问题:

一组数据各个偏差的平方和的大小,与数据本身有关,但与数据的容量无关。( )

考点:理财规划师理财规划理论知识理财计算基础(三)
题型:判断题

阅读理解。

     For a long time, a boy wondered why his next-desk classmate was always the first in the class,

while he could only rank (排名) the 21st. At home, he asked his mom, " Am I more stupid than other

kids? How come I always fall behind?I can't come up with an answer. " Mom knew that her son's

self-respect (自尊心) had been hurt by the ranking system, but she didn't know what to say to help.

    She had really wanted to say that intelligence (智力) differs and that yes, her son's friend was really

a smarter boy. But that would make her son lose heart. So she didn't say it.

    Her son and his friend went on to a high school that year. Although her son tried as hard as he could,

his friend still left him behind. But she was proud of her boy for his hard work. It was around this time

she decided to take him on a trip to the seaside. On the trip, she at last found an answer for him.

Today her son no longer cares about rankings. He doesn't have to, for he himself is now at the top of the

class in a university. When invited to his old high school, he mentioned a valuable childhood experience:

Once on a trip to the sea, my mother and I were lying on the beach. She pointed to the sea and said to

me: Do you see seabirds fighting for food out there?When a wave (海浪) comes near, the little birds

rise quickly. The "clumsy"  seagulls (海鸥) are far less quick and have to tried hard to get away from the

wave. But they prove to have the biggest, strongest wings,which open the widest and allow the bird to

travel the furthest. When the season changes, they leave for foreign shores, leaving the little birds behind.

Son, I have feeling that you are one of those seagulls. "

1. From the first paragraph (段), we know that the mother _____.   

 A. knew her son was not bright enough     

B. decided to help with her son's school work.     

C. was worried about her son's low rankings

D. saw the negative effects (负面影响) of the ranking system

2. The mom was glad she didn't give an answer at first because _____.     

A. she knew her son would forget his rankings soon     

B. she felt intelligence doesn't mean everything     

C. she knew he was not strong enough for the truth

D. she wanted to avoid another blow (打击) to her son's self-respect

3. What does the underlined word " clumsy" mean here?

A. 灵巧的         

B. 笨拙的         

C. 聪明的      

D. 勇敢的

4. Which is true according to the passage?     

A. Ranking system had no effect on him.     

B. Her son's rankings have always been low.     

C. Only rankings show intelligence.

D. Hard work and confidence can lead to a change in rankings.

5. Which of the following would be the best title for the passage?

A. How important rankings are                   

B. Little birds and seagulls 

C. The answer Mom gave                       

D. Hard work leads to good results

题型:判断题

给下列句子选择合适的词,使句子更生动。

叭叭  哐当  叮咚叮咚  吱吱  咕咚咕咚     

1.粗大的雨点落下来,打在玻璃窗上____________直响。

2.玉米苗一定会____________喝个痛快。

3.泉水____________地向前流着。

4.一阵狂风吹过,门____________一声关上了。

5.小风车____________地转了起来。

题型:判断题

如下图四个大小相同的装置,同时置于阳光下,温度不变,过一段时间后可观察到a与b液面(液体为水)高度差最大的是(  )

A.

B.

C.

D.

题型:判断题

关于Marcus-Gunn瞳孔,说法错误的是()

A.相对性传入瞳孔障碍

B.患眼对光反应减弱和迟钝

C.遮盖健眼时患眼瞳孔缩小,取消遮盖患眼瞳孔稍散大

D.见于严重的视网膜病变,视功能明显受损时

E.可见于视神经炎

题型:判断题

简述蒸汽冷凝的两种形式。

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