下列用于减少CT影像运动伪影的方法，错误的是（）。 A.检查前训练病人呼吸 B.减少

把词语补充完整。

张____结____　　画龙____ ____　　自相____ ____　　滥____ ____数　　乌云____ ____

无痛性梗阻性黄疸伴胆囊增大最可能是（）。

A.硬化性胆管炎

B.胆囊结石

C.壶腹周围癌

D.胆道蛔虫病

E.十二指肠 * * 炎

男，58岁，间断腹部隐痛9月，贫血3月，近日加重并伴有柏油样便，CT所见如图，最可能的诊断是（）

A.小肠淋巴瘤

B.小肠恶性间质瘤

C.小肠重复畸形

D.小肠癌

E.小肠淋巴肉瘤

安全制度是信息安全的重要保障，以下关于信息系统安全管理制度说法不正确的是______。

A．安全管理制度需要建设单位、监理、承建单位三方人员共同执行
B．安全管理制度需要由监理单位制定，并报建设单位批准后执行
C．安全管理制度包括出入管理、系统升级、人事管理、应急等相关制度
D．安全管理制度的有效执行是系统安全建设成功实施的关键

Science is a dominant theme in our culture. Since it touches almost every facet of our life, educated people need at least some acquaintance with its structure and operation. They should also have an understanding of the subculture in which scientists live and the kinds of people they are. An understanding of general characteristics of science as well as specific scientific concepts is easier to attain if one knows something about the things that excite and frustrate the scientist.
This book is written for the intelligent student or lay person whose acquaintance with science is superficial, for the person who has been presented with science as a musty storehouse of dried facts, for the person who sees the chief objective of science as the production of gadgets, and for the person who views the scientists as some sort of magician. The book can be used to supplement a course in any science, to accompany any course that attempts to give an understanding of the modern work, or--independently of any course --simply to provide a better understanding of science. We hope this book will lead readers to a broader perspective on scientific attitudes and a more realistic view of what science is, who scientists are, and what they do. It will give them an awareness and understanding of the relationship between science and our culture and an appreciation of the roles science may play in our culture. In addition, readers may learn to appreciate the relationship between scientific views and some of the values and philosophies that are pervasive in our culture.
We have tried to present in this book an accurate and up-to-date picture of the scientific community and the people who populate it. That population has in recent years come to comprise more and more women. This increasing role of women in the scientific subculture is not a unique incident but, rather, part of the trend evident in all segments of society as more women enter traditionally male-dominated fields and make significant contributions. In discussing these changes and contribution, however, we are faced with a language that is implicitly sexist, one that uses male nouns or pronouns in referring to unspecified individuals. To offset this built-in bias, we have adopted the policy of using plural nouns and pronouns whenever possible and, when absolutely necessary, alternating he and she. This policy is far from being ideal, but it is at least an acknowledgment of the inadequacy of our language in treating half of the human race equally.
We have also tried to make the book entertaining as well as informative. Our approach is usually informal. We feel, as do many other scientists, that we shouldn’t take ourselves too seriously. As the reader may observe, we see science as a delightful pastime rather than as a grim and dreary way to earn a living.

This passage most probably is ______.

A. a book review



B. the preface of a book
C. the postscript of a book

D. the concluding part of a book