已知一元二次方程有一个根是1,那么这个方程可以是( )。(写一个即可)

题型:填空题

问题:

已知一元二次方程有一个根是1,那么这个方程可以是(     )。(写一个即可)

考点:一元二次方程的定义
题型:填空题

阅读理解。

     In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist.

So he invented a very simple camera (照相机). He put it in a window of his house and took a picture of

his garden. That was the first photo.

     The next important date in the history of photography (摄影术) was in 1837. That year, Daguere,

another Frenchman, took a picture of his reading room. He used a new kind of camera in a different way.

In his picture you could see everything very clearly, even the smallest thing. This kind of photo was called

a Daguerreotype.

     Soon, other people began to use Daguerre's way. Travelers brought back wonderful photos from all

around the world. People took picture of famous buildings, cities and mountains.

     In about 1840, photography was developed. Then photographers could take picture of people and

moving things. That was not simple. The photographers had to carry a lot of film and other machines. But

this did not stop them, for example, some in the United States worked so hard.

     Mathew Brady was a famous American photographer. He took many pictures of gread people. The

picture were unusual because they were very lifelike (栩栩如生的). 

     Photographers also became one kind of art by the end of the 19th century. Some photos were nor just

cooies of the real world.They showed and feelings, like other kinds of art.

1. The first photo taken by Niepce was a picturte of ______. [ ]

A. his business   

B. his house  

C. his garden   

D. his window

2. The Daguerrotype was ______. [ ]

A. a Frenchman    

B. a kind of picture   

C. a kind of camera   

D. a photographer

3. If a photographer wanted to take pictures of moving things in the year of 1840, he had to ______. [ ]

A. watch lots of films

B. buy an expensive camera

C. stop in most cities

D. take many films and something else with him.

4. Mathew Brady ______.[ ]

A. was very lifelike      

B. was famous for his unusual pictures

C. was quite strong     

D. took many pictures of moving people

5. This passage tells us ______. [ ]

A. how photography was developed

B. how to show your ideas and feelings in pictures

C. how to take pictures in the world

D. how to use different cameras

题型:填空题

关于腰椎侧位标准片的说法,下列哪项不妥()

A.第12胸椎、第1~5腰椎、腰骶关节显示于照片正中

B.诸椎体各缘除经第三腰椎重叠投影外,其余椎体全均呈双边显示

C.照片应包括各腰椎棘突

D.棘突、腰骶关节、各腰椎椎间隙应清晰显示,对比较好

E.诸椎体结构及骨纹理清晰

题型:填空题

在一个边长17米的正方形ABCD的A点,有红、蓝两个甲虫.9:00同时沿着边以相同的速度爬行.红甲虫由A----B-----C----D;蓝甲虫由A---D---C.9:30红甲虫爬到AB间距离A点10米的E点后继续向前爬去,10:15到BC间的F点,再经C向前爬去.蓝甲虫爬到AD间距离D点5米的G点休息了一会儿再往前爬去.当两个甲虫在CD上的H点相遇时,凑巧四边形EFHG的面积是正方形面积的一半.求蓝甲虫在G点休息了多长的时间?

题型:填空题

近年来,长江水的含沙量逐年增加,水质变浑浊。有科学预测,如果这样发展下去,长江将变成第二条黄河。你认为造成这种现象的主要原因是 [ ]

A.雨量过大   

B.河道不通畅   

C.沿江围湖造田    

D.上游过度开发,植被破坏严重

题型:填空题

明敷或暗敷于干燥场所的金属管布线应采用管壁厚度不小于( )mm2的电线管。

A.1

B.1.5

C.2.5

D.4

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