引起败血症的常见厌氧菌有（） A.脆弱类杆菌 B.不动杆菌属 C.消化链状菌 D.梭

患者男，25岁，因“腰骶部酸痛不适3年余，加重1个月”来诊。3年前无明显原因出现腰骶部酸痛不适，受凉后加重，腰部活动受限，并有加重趋势，交替出现双下肢放射性疼痛，行走不便，口服吲哚美辛可缓解。1个月前诸症加重，求治本院。查体：脊柱向前呈弓形弯曲，胸段显著后突，胸廓扁平。沿脊柱两侧有轻压痛。

提示患者红细胞沉降率25 mm/1h，类风湿因子（-），HLA-B27（+），X线片：颈、胸、腰椎关节模糊不整，前后纵韧带及脊椎间韧带钙化，脊柱向前弯曲。双骶髂关节间隙变窄，关节边缘呈锯齿样。目前主要考虑的疾病为（）

A.腰椎管狭窄症

B.腰椎间盘突出症

C.腰椎骨质增生症

D.腰椎骨质疏松症

E.强直性脊柱炎

F.腰椎肿瘤

　　Decision-thinking is not unlike. It often matters not only what you think, but also what others think you think and what you think they think you think. The mental process（过程） is similar. Naturally, this card game has often been of considerable interest to people who are, by any standards, good thinkers.

　　The great mathematician John von Neumann was one of the founders of game theory. In particular, he showed that all games fall into two classes; there are what he called games of 'perfect information', games like chess where the players can't hide anything or play tricks; they don't win by chance, but by means of logic and skills. Then there are games of 'imperfect information', like poker, in which it is impossible to know in advance that one course of action is better than another.

　　One mistaken idea about business is that it can be treated as a game of perfect information. Quite the reverse, business and life itself are games which we must normally play with very imperfect information. Business decisions are often made with many unknown and unknowable factors（因素）, as best poker players. But few business people find it comfortable to admit that they are taking a chance, and many still prefer to believe that they are playing chess, not poker.

49．The subject discussed in this text is _________.

　　A．the process of reaching decisions

　　B．the difference between poker and chess.

　　C．the secret of making good business plans

　　D．the value of information in winning games

50．An important factor in a game of imperfect information is ___________.

　　A．rules               B．luck         C．time               D．ideas

51．Which of the following can be used in place of "Quite the reverse"?

　　A．Quite right.                   B．True enough.

　　C．Most unlikely.                      D．Just the opposite.

52．In the writer's opinion, when making business decisions one should ___________ .

　　A．put perfect information before imperfect information

　　B．accept the existence of unknown factors

　　C．regard business as a game of chess

　　D．mix known and unknown factors

ZXDU3000系统集中监控单元CSU在主菜单上，使用组合键（），可以重新设定CSU的密码。

A、下、左

B、上、下

C、上、左

D、下、右

掩护式液压支架控制元件的基本组成部分是（）等。

A、马达

B、控制阀

C、油管

D、支柱

E、操纵阀

下列指标中，属于相对指标的有（）

A．商品零售额

B．物价指数

C．股票价格

D．土地面积

E．经济增长率