顺铁路线路在两线间行走主要是注意什么？

四书五经是四书和五经的合称、是中国儒家的经典书籍。下面不属于儒家经典的四书的是( )。

A．《论语》

B．《孟子》

C．《大学》

D．《尚书》

患儿男，1岁，因“体重增长缓慢、气促3个月”来诊。既往史无特殊。查体：T36.5℃，P178次/min，R35次/min，BP88/47mmHg。口唇发绀，颈静脉怒张。水冲脉，左胸骨旁全收缩期杂音，可以听到舒张期杂音，第二心音单一，口唇及甲床发绀，肝增大。

术后早期生存率取决于（）(提示 治疗1周后患儿症状有所好转，于全身麻醉体外循环下行永存动脉干根治术。)

A.肺血管阻力

B.共干瓣膜有无反流

C.体重的大小

D.营养状态

E.并发畸形

F.术后感染情况

　　In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist. So he invented a very simple cameras. He put it in a window of his house and took a picture of his yard. That was the first photograph.

　　The next important date in the history! of photography was 1837. That year, Daguerre, another French, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything very clearly, even the smallest details. This kind of photograph was called a daguerreotype.

　　Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities and mountains.

　　In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple. The photographers had to cary lots of films and processing equipment. But this did not stop the photographers, especially in the United States. After 1840s daguerreotype artists were popular in most cities.

　　Mathew Brady was a well - known American photographer. He took many pictures of famous people. The pictures were unusual because they were very life - like and full of personality （个性）.

　　Brady was also the first preson to take pictures of war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.

　　In the 1880s, new inventions began to change photography... Photographers could buy films readymade in rolls（卷）. So they did not have to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later meaning that they did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.

　　With the small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends and favorite places. They called these pictures" snapshot".

　　Photographs became very popular in newspapers in the 1890s. Soon magazines and books also used documentary photographs. These pictures showed true events and people. They were much more real than drawing.

　　Photography also turned into a form of art by the end of the 10th century. Some photographs were not just copies of the real world. They showed ideas and feelings, like other art forms.

　　小题1:The passage is mainly about ________.

A．the inventoin of cameras

B．a kind of new art - photography

C．the development of photography

D．the important dates in the history of photography　　　小题2:The first pictures of a war were taken by________.

A．a French photographer in the 1840s

B．an American photographer in the 1860s

C．a German reporter in the 1880s

D．a French artist in the 1890s　　小题3:Photography can also be an art form because artists can ________.

A．take anything they like

B．keep a record of real life

C．take photos of the famous

D．show ideas and feeling in pictures

两个正态双变量资料，自变量记为X，因变量记为Y，进行回归分析，回归系数为0.2，经，P＝0.05，则

A．X增大一个单位，Y增大0.2个单位

B．X增大一个单位，Y减少0.5个单位

C．X增大一个单位，Y增大0.05个单位

D．X增大一个单位，Y减少0.2个单位

E．X增大一个单位，Y减少或增大0.2个单位都有可能

通常无差异曲线的形状是一条（）

A.向左下方倾斜的曲线

B.向右下方倾斜的曲线

C.垂线

D.平行线