两个正方体金属块A、B密度ρA∶ρB为27∶16,边长LA∶LB=2∶3,按如图

题型:选择题

问题:

两个正方体金属块A、B密度ρA∶ρB为27∶16,边长LA∶LB=2∶3,按如图叠放在水平地面上,金属块B对地面压强为P1,若取走金属块A,金属块B对地面压强为P2,则P1∶P2

[ ]

A.3∶2

B.16∶27

C.27∶8

D.9∶4

考点:压强的大小及其计算
题型:选择题

阅读理解。

     Over 1,400 university students from 37 countries and regions came to China for the 2006's WorldMUN

meeting (世界大学生模拟联合国大会). The meeting was held in Peking University from March 27th to

31st, 2006.

     The idea of the WorldMUN began in 1991. A group of students at Harvard (哈佛) University wanted to

make a new meeting to bring together the students who were interested in the world. They wanted to discuss

different problems around the world. The WorldMUN is based on understanding, compromise, learning and

friendship. The first meeting was held in Poland in 1992. After that, it is held in spring every year. Last year,

it was held in Scotland.

     This was the first time the WorldMUN meeting was held in Asia. It was also the biggest one in history.

The students came from the best universities around the world. During the five-day meeting, they did

everything that people in the UN do. Though their skin colors and cultures were different, they had the same

wish to make the world better.

1. The 2006's WorldMUN meeting was held in _____.

A. Scotland

B. Harvard University

C. Poland

D. Peking University

2. So far, the WorldMUN meeting has been held _____.

A. 13 times

B. 14 times

C. 15 times

D. 16 times

3. The word "compromise" in the passage means _____ in Chinese.

A. 友谊

B. 理解

C. 和解

D. 屈服

4. Which of the following is NOT true?

A. The students want to travel around the world.

B. The students are interested in the world.

C. The students want to discuss different problems.

D. The students wish to make the world better.

5.The best title of the passage is _____.

A. The First WorldMUN Meeting

B. The WorldMUN Meeting

C. University Students

D. Problems Around the World

题型:选择题

底坑下有能进人的空间时,底坑地板的强度应能承受不小于()/m2的负荷。

A.300N

B.500kg

C.5000N

题型:选择题

把4x2+1加上一个单项式,使其成为一个完全平方式,在下列单项式4x,-4x,4x4,-1,2x,-4x2中,符合条件的有(  )

A.3个

B.4个

C.5个

D.6个

题型:选择题

糖尿病酮症酸中毒()
高渗性非酮症糖尿病昏迷()

A.1型糖尿病多见

B.2型糖尿病多见

C.呼吸性酸中毒

D.呼吸性碱中毒

E.代谢性碱中毒

题型:选择题

患者男性,20岁。近日来咳嗽,少量痰液,2日前起呼吸困难,带哮鸣音,大汗,面色苍白,肢凉,脉搏120次/分,血压90/60mmHg,双肺满布哮鸣音,心脉无杂音,口唇发绀。

该患者最可能的诊断是()。

A.重症肺炎

B.急性左心衰竭

C.肺炎球菌肺炎

D.过敏性肺炎

E.喘息型慢性支气管炎

F.重症哮喘

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