图中所示硬脊膜穿破后的头痛的发生原理，请问其发生率约为（）

[问答题]Passage 4Questions 34 - 45　　● Read the article below about stock exchange.　　● In most of the lines 34 - 45 there is one extra word. It is either grammatically incorrect or does not fit in with the sense of the text. Some lines, however, are correct.　　● If a line is correct, write CORRECT on your Answer Sheet.　　● If there is an extra word in the line, write the extra word in CAPITAL LETTERS on your Answer Sheet.　　● The exercise begins with two examples, (0) and (00)　　0. The London Stock Exchange has always been famous as a place for men only, and women　　00. used to be strictly forbidden to enter in. But the world is changing day by day, and even the　　34. Stock Exchange, which seemed to be a man’s castle, is being gradually opening its doors to the　　35. other sex. On 16th November 1971, a great decision was taken out. The Stock Exchange　　36. Council (the body of men that administers the Stock Exchange) decided that women be　　37. allowed to the new trading floor when it opened in 1973. But the “castle” had not been very　　38. completely conquered. The first girls to work in “The House” were not brokers or jobbers.　　39. They were neither allowed to be become partners in stocking firms, nor to be authorized dealers　　40. in stocks and shares. They were simply junior clerks and telephone operators. Women all　　41. have been trying to get into the Stock Exchange for many years. Several votes have been　　42. taken in “The House” to see whether the members would be willing to allow many women　　43. to become members, but the answer has always been “No”. There have been three refusals of　　44. this kind since 1967. Now women are admitted, although they in a very junior capacity.　　45. Actually, it is the only a matter of time, it will sure take place sooner or later.

[判断题]平行结转分步法就是为了分步计算半成品成本而采用的一种分步法，也称计算半成品成本分步法。

[判断题]由于并联弹性成分的粘弹性特点，拉长产生的被动张力有随时间延长而上升的特性。

[单选题]下列选项中，（）可以衡量企业对劳动的投入与收益。

[单选题]射线束硬化伪影出现的原因是（）

[单选题]人体重要淋巴结的分布①人体重要淋巴结分布在人体全身各部位区域②淋巴结一般为集合群，分布在身体特定区域③人体重要淋巴结分布在胸腹颈部腹股沟区④人体重要淋巴结分布在颈、腋窝、纵隔、腹主动脉、髂、腹股沟和咽窝区（）

[多选题]有关备份和容灾基础知识，描述正确的有？（）

[单选题]对进口付汇电子数据核查表述正确的是（）。

[单选题]正常情况下，依照法定程序延长的工作时间每月不能超过（　　）。

[名词解释题]超结构