已知函数f（x）是定义在R上的可导函数，其导函数记为f′（x），若对于任意实数x

停经10周，阵发性腹痛1天， * * 出血 5小时，查宫颈口开大容1指，有组织物嵌顿，子宫如孕7周大小，质软。

诊断为

A．异位妊娠

B．先兆流产

C．难免流产

D．不全流产

E．流产感染

The National Gallery of Art in Washington, D.C., is one of the world’s greatest art museums. Millions of people have entered its doors to see paintings by the world’s fine artists. But if these priceless masterpieces are to be preserved, the Gallery must protect them carefully. The Gallery’s 135-man guard force has successfully prevented them from being stolen, but protecting the paintings from nature is a greater problem.

In past times, the owners of paintings did not protect them from damaging changes in humidity（湿度）and temperature. As a result, the life of these paintings were shortened. In the National Gallery, however, humidity and temperature are carefully controlled. The building is air-conditioned in summer and heated in winter. The air-conditioning and heating system are so important to the life of the painting that the Gallery has two of each system. If one should fail, the extra one can take over.

Light is another enemy of paintings. Ultraviolet rays（紫外线）in light cause paintings to fade（褪色）. Long ago, paintings often hung in dark churches and palaces. A coat of varnish（清漆）was a protection from the weak light. But when museums took over the care of many paintings, they were often hung in brighter light than before. Soon they were in danger of fading. The damaging effects of light were increased when the museums removed the varnish coating, yellowed with age.

To protect its paintings, the National Gallery put a special kind of glass in its skylights. This glass allows visible lights to enter the building but it keeps out harmful ultraviolet rays. The Gallery has also developed new and better varnishes which help to keep paintings from fading. Thanks to these new precautions, many of the world’s greatest paintings are being well protected for future generations to enjoy.

小题1:The text mainly tells us about_________________________.

A．the guard force in the National Gallery

B．protecting great paintings from nature

C．priceless paintings of past times

D．the air-conditioning and heating systems in the National Gallery小题2:Which of the following is NOT an enemy of paintings?

A．Varnish.

B．Temperature.

C．Light.

D．Humidity.小题3:The underlined word “precautions” in Paragraph 4 is closest in meaning to ____________.  

A．decorations

B．problems

C．suggestions

D．applications小题4:From the text we can infer that________________________.

A．great artists painted in dark churches and palaces

B．you can touch these paintings while you are in the National Gallery

C．the care of the world’s greatest paintings is both a big responsibility and a great challenge

D．the guard force in the Gallery has not done a good job

（13分）如图所示，传送带以一定速度沿水平方向匀速运动，将质量m＝1.0kg的小物块轻轻放在传送带上的P点，物块运动到A点后被水平抛出，小物块恰好无碰撞地沿圆弧切线从B点进入竖直光滑圆弧轨道下滑．B、C为圆弧的两端点，其连线水平，轨道最低点为O，已知圆弧对应圆心角θ＝106°，圆弧半径R＝1.0m，A点距水平面的高度h＝0.8m，小物块离开C点后恰好能无碰撞地沿固定斜面向上滑动，经过 0.8s小物块经过D点，已知小物块与斜面间的动摩擦因数μ＝.(取sin53°＝0.8，g＝10m/s2)求：

(1)小物块离开A点时的水平速度大小；

(2)小物块经过O点时，轨道对它的支持力大小；

(3)斜面上C、D间的距离．

一般地，冲击力指向汽车质心比不指向汽车质心所造成的损坏（）

A.轻

B.差不多

C.更严重

D.没影响

都察院