驾车准备超车时，遇交叉路口、人行横道、漫水路、漫水桥及规定时速不准超过30公里的路段

下列关于基督教的叙述，不正确的是( )。

A．约产生于公元前1世纪中叶

B．早期基督教具有消极性、虚妄性和空想性

C．《米兰敕令》承认了基督教的合法地位

D．尼西亚大会标志着原始基督教质变的最后完成

阅读理解。

     Some wonderfully creative uses of X-rays have been in the world of art.But the most impressive one

is to uncover what has been covered up.Details unfolded by an X-ray of a painting can ' t be seen any

other way.For example, in the past, paintings were often repaired if small pieces of paint fell off the

canvas (帆布). These repairs cannot be seen just by looking at the painting.It takes an X-ray to discover where the repairs have been made.

    An X-ray of a painting is one of the best ways to tell if it was created by a famous painter or if it is a

forgery.If there is a question as to whether an old master has painted a certain painting or not, X-rays

are made and compared to those of paintings that are known to be original.If the brushstrokes (笔迹) ,

for example, are shown to be totally different than in other work done by a certain artist, then the painting

is proved to be a fake copy.

     Since modern paints are usually made from different materials than paints of hundreds of years ago,

the image they leave on an X-ray film looks different.This is another way X-rays can be used to spot a

forgery.A modem artist will try to make a forgery look hundreds of years old by painting dirty vamish on

it or by using artificial means to get the varnish to look cracked.To the naked eye the forgery may look

old, but when a careful study of the X-ray image is made, the deception is obvious.

     It was common many years ago for an artist to finish a painting, decide it wasn't any good, and paint

a completely different picture on top of it.Or artists would paint over others' work -it was their version

of recycling.Taking an X-ray is the only way to find out if there is a picture under the picture you see with

your eyes.Sometimes museums will be more interested in the painting beneath than the one on top, and

will restore the older one by having the top layer painstakingly removed.

1.What is the main purpose of the article?  

A. To provide information to the police who are looking for stolen art.

B. To persuade art dealers to check for fake copies before selling art.

C. To explain how modern technology can be applied in unique ways.

D. To help artists restore damaged artwork to its original appearance.

2. According to the passage, X-rays are used to ______. 

A. make repairs on paintings in the past

B. tell if an artwork is original or not

C. change the materials of a forgery

D. remove the recyclable paints

3. In Paragraph 3, the word "deception" probably means ______.

A. comparison  

B. drawback    

C. trickery          

D. judgement

4.Which is the best title for the passage?

A. X-ray Detectives              

B. Creative Uses of Technology

C. Forgery Studies                

D. X-ray Painting Technique

工作人员在10kV及以下电压的电气设备上作业时，人体与导体间的安全距离是30cm。

简述刑事拘留与逮捕的区别？

一般来说，各风险因子的变动是呈（）的，此时采用一般的风险管理模型便己足够，但在市场出现重大变化时，各风险因子便会变得难以预测，过去的历史资料对预测此类变化的帮助极少。

A.指数分布

B.正态分布

C.泊松分布