双绞线可以用来作为数字信号和模拟信号的传输介质。

对于诊断血清不正确的叙述是（）

A.多价诊断血清，又称混合诊断血清

B.单价诊断血清是仅含一个群（型）细菌和相应抗体

C.因子诊断血清，吸收了其中的共同抗体，仅保留了一种所需的特异抗体

D.抗O诊断血清是细菌表面抗原（O抗原）免疫动物获得的血清

E.Vi诊断血清是由表面抗原制备的诊断血清

IV. 阅读理解（共15小题；每小题2分,满分30分）

Every year when the Italian artist Michelangelo’s (1475－1564，意大利文艺复兴时期著名雕刻家、画家、建筑师) birthday comes around, computer users all over the world are filled with fear (害怕) and use their computers with care. Some may even choose not to turn on their computers on March 3. All this fear and care are just because a deadly computer virus is ready to cause damages on that day.

What’s a computer virus then? Why do people get so afraid of it?

A computer virus is, in fact, a little program that is put into other programs and that does something bad. It is called a virus because, like any real-life viruses such as AIDs virus, it reproduces itself. And when these programs are run, the virus is brought to life. It hides itself in your computer system waiting for the right moment to make damages. And at the same time it keeps producing itself by copying itself onto other programs.

The Michelangelo virus waits until the artist’s birthday comes around, and then it will wake up to do very bad things like destroying you files (毁坏文档) . So next time when you turn on your computer, look out for computer viruses!

56. The Italian artist Michelangelo ____________.

A. was born six centuries ago                            B. was born on March 3, 1475

C. died six centuries ago                            D. died on March 3, 1564

57. Why are computer users full of fear on March 3?   Because _________.

A. it is the birthday of a famous Italian artist.

B. a kind of computer virus will be produced on that day

C. “the Michelangelo virus” will wake up and then cause damages on that day.

D. everything will go wrong with computers on that day.

58. In fact, a computer virus is __________.

A. a program which can be put into computers with some damages to them.

B. a kind of real-life virus.

C. a kind of virus like AIDS virus

D. a kind of program which is placed into other programs and which makes damages

59. In fact, a computer virus is ready to cause damages _________

A. on any day                                    B. only on March 3   

C. on Fridays                                     D. only on some famous artists’ birthdays

60. What should we do to protect our computers from virus according to the passage?

A. Don’t turn any computer on.    

B. Be careful.

C. Destroy our files before viruses. 

D. Don’t use computers to do important work.

信贷档案是确定借贷双方法律关系和权利义务的重要凭证，是贷款管理情况的重要记录。（）

出版物发行企业现金和支票安全有哪些基本要求？