叉车操作证检测时间为（）A、半年 B、两年 C、四年 D、五年

微波是一种高频电磁振荡，微波炉就是利用高频电磁振荡使食品中分子也产生振荡而发热，现代医学上使用微波手术刀进行外科手术，其好处主要是使开刀处的血液迅速凝固而减少失血，关于其作用原理的说法正确的是（　　）

A．微波电流迅速中和血液胶粒所带的电荷而使血液聚沉

B．微波使局部血液受热而使血液胶体聚沉

C．微波电流通过金属手术刀时产生的高温使血液凝固

D．以上说法都不正确

离子检验的常用方法有三种                  

检验方法	沉淀法	显色法	气体法
含   义	反应中有沉淀产生或溶解	反应中有颜色变化	反应有气体产生

下列离子检验的方法不合理的是

A．CO₃^2－—气体法      B．Cl^－—沉淀法   C．Fe³⁺—气体法  D．OH^－—显色法

下列叙述中，正确的是

A．用E-R图能够表示实体集间一对一的联系、一对多的联系和多对多的联系

B．用E-R图只能表示实体集之间一对一的联系

C．用E-R图只能表示实体集之间一对多的联系

D．用E-R图表示的概念数据模型只能转换为关系数据模型

城建档案管理部门在进行工程档案验收时，应重点验收（）内容。

A.工程档案分类完整、系统完整；其内容要真实准确地反映工程建设活动和工程实际状况

B.工程档案已整理立卷，立卷符合《建设工程文件归档整理规范》的规定

C.竣工图绘制方法、图式及规格等符合专业技术要求，图面整洁，盖有竣工图章

D.文件的形成、来源符合实际，要求单位或个人的签章的文件，其签章手续完备；其中，文件的材质、幅面、书写、绘图、用墨、托裱等符合要求

E.文件要有明确的文档体系及其所述内容要包含工程建设的全过程

Analysts have their go at humor, and I have read some of this interpretative literature, (1) without being greatly instructed. Humor can be (2) , (3) a frog can, but the thing dies in the process and the innards are (4) to any but the pure scientific mind.

One of the things (5) said about humorists is that they are really very sad ’people clowns with a breaking heart. There is some truth in it, but it is badly (6) . It would be more (7) , I think, to say that there is a deep vein of melancholy running through everyone’s life and that the humorist, perhaps more (8) of it than some others, compensates for it actively and (9) Humorists fatten on troubles. They have always made trouble (10) They struggle along with a good will and endure pain (11) , knowing how well it will (12) them in the sweet by and by. You find them wrestling with foreign languages, fighting folding ironing hoards and’ swollen drainpipes, suffering the terrible (13) of tight boots. They pour out their sorrows profitably, in a (14) of what is not quite fiction nor quite fact either. Beneath the sparking surface of these dilemmas flows the p (15) of human woe.

Practically everyone is a manic depressive of sorts, with his up moments and his down moments, and you certainly don’t have to be a humorist to (16) the sadness of situation and mood. But there is often a rather fine line between laughing and crying, and if a humorous piece of writing brings a person to the point (17) his emotional responses are untrustworthy and seem likely to break over into the opposite realm, it is (18) humor, like poetry, has an extra content, it plays (19) to the big hot fire which is Truth, and sometimes the reader feels the (20) .

8（）

A.consciously

B.credulous

C.sensible

D.absurd