正方体的棱长扩大到原来的2倍,表面积就扩大到原来的4倍.______.

题型:解答题

问题:

正方体的棱长扩大到原来的2倍,表面积就扩大到原来的4倍.______.

考点:和差积商的变化规律长方体的表面积正方体的表面积
题型:解答题

已知椭圆的中心在坐标原点O,焦点在x轴上,椭圆的短轴端点和焦点所组成的四边形为正方形,两准线间的距离为l.

(Ⅰ)求椭圆的方程;

(Ⅱ)直线l过点P(0,2)且与椭圆相交于A、B两点,当△AOB面积取得最大值时,求直线l的方程。

题型:解答题

劳动卫生中,哪项不是生物检测的特点()

A.反映不同途径的总接触量

B.放映不同来源的总接触量

C.直接检测内剂量和内负荷

D.检测毒物的代谢

E.检测空气质量

题型:解答题

Facing a beggar, I may feel this poor person needs help, and the need will not be met _____ I put my

hand in my pocket now.[      ]

A. since

B. in case

C. unless

D. while

题型:解答题

READING COMPREHENSION

     Directions: Read the following three passages. Each passage is followed by several questions or unfinished statements. For each of them there are 4 choices marked A, B, C and D. Choose the one that fits best according to the information given in the passage.

     Everyone has got two personalities — the one that is shown to the world and the other that is secret

and real. You don't show your secret personality when you're awake because you can control your

behaviour, but when you're asleep,  your sleeping position shows the real you. In a normal night, of

course, people frequently change their position. The important position is the one that you go to sleep in.  

     If you go to sleep on your back, you're a very open person. You normally trust people and you are

easily influenced by fashion or new ideas. You don't like to upset people, so you never express your real

feelings. You're quite shy and you aren't very confident.  

     If you sleep on your stomach, you are a rather secretive(不坦率的)person. You worry a lot and

you're always easily upset. You're very stubborn(顽固的), but you aren't very ambitious. You usually

live for today not for tomorrow. This means that you enjoy having a good time.  

     If you sleep curled up(卷曲), you are probably a very nervous person. You have a low opinion of

yourself and so you're often defensive. You're shy and you don't normally like meeting people. You

prefer to be on your own. You're easily hurt.  

     If you sleep on your side, you have usually got a well-balanced personality. You know your strengths

and weaknesses. You're usually careful.  You have a confident personality. You sometimes feel anxious,

but you don't often get depressed. You always say what you think even if it annoys people.        

1. According to the writer, you naturally show your secret and real personality __________.

A. only in a normal night

B. only when you're sleeping

C. only when you refuse to show yourself to the world

D. only when you change sleeping position 

2. Which is NOT mentioned in the second paragraph about a person's personality? 

A. He /she is always open with others.

B. He /she always likes new ideas earlier than others.

C. He /she is always easily upset.

D. He /she tends to believe in others. 

3. Point out which sentence is used to show the personality of a person who is used to sleeping

on his/her stomach? 

A. He /she is always optimistic.

B. He /she doesn't want to stick to his or her opinion.

C. He /she always enjoys his/her real life.

D. He /she often dreams to be a big person. 

4. Maybe you don't want to make friends with a person who sleeps curled up. Why? 

A. He/she would rather be alone than communicate with you.

B. He/she is rarely ready to help you.

C. He/she prefers staying at home to going out.

D. He/she wouldn't like to get help from you. 

5. It appears that the writer tends to think highly of the person who sleeps on one side because ______ . 

A. he /she always shows sympathy for people

B. he /she is confident, but not stubborn

C. he /she has more strengths than weaknesses

D. he/ she often considers annoying people 

题型:解答题

在企业管理体制现状调查和分析过程中,以下哪种做法是不恰当的( )

A.企业内部状况调查主要包括深入了解企业概况、企业组织机构和责任、人员结构、经营状况、事业或产品构成、企业发展战略等
B.企业外部环境调查所需的资料,应该通过企业外部独立获得,不宜采用企业提供的资料
C.调查结论既应是对本企业管理体制现状的认识,又应是与企业领导人交流基础上取得共识
D.调查结论主要回答以下几个问题:事业或产品特点的归纳;企业发展战略和目标的表述;企业的优、劣势;企业管理体制的优点和问题

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