单选题
科技档案是科技生产活动的（）。
发布日期：2021-04-06
历史记录
原始记录
文字记录
现实记录
试题解析
科学技术档案
科技档案主要产生于从事自然科学研究、生产技术和基本建设等活动的单位，一些行政管理单位也有自身的基本建设活动。一些专业主管单位也颁发有关科技工作的指示、决定、规程、规范和审批文件等，在基层科技单位也将这些文件归入科技档案中。
- 中文名
- 科学技术档案
- 释义
- 记载科学技术的书写和保存系统
生产活动
生产活动是制造业企业经营活动的核心，即由生产工人利用机器设备对原材料进行加工和装配，生产出市场所需的各种产品的活动。
- 中文名
- 生产活动
- 定义
- 制造业企业经营活动的核心
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女性，18岁，3周前因急性化脓性扁桃体炎发烧，治疗后好转，近日来出现眼睑水肿，血压增高，尿少，呼吸困难，不能平卧而就诊首先应该选择哪项检查（）
斑贴试验的实质是（）
Directions:In this part there are one passage with five questions. Read the passage carefully, then answer the questions in the fewest possible words (not exceeding 10 words). Questions 1 to 5 are based on the following passage: Centuries ago, man discovered that removing moisture from food helps to preserve it, and that the easiest way to do this is to expose the food to sun and wind. In this way the North American Indians produce pemmican (dried meat ground into powder and made into cakes), the Scandinavians make stockfish and the Arabs dry dates and “apricot leather”.All foods contain water—cabbage and other leaf vegetables contain as much as 93% water, potatoes and other root vegetables 80%, lean meat 75% and fish anything from 80% to 60% depending on how fatty it is. If this water is removed, the activity of the bacteria which cause food to go bad is checked. Fruit is sun-dried in Asia Minor, Greece, Spain and other Mediterranean countries, and also in California, South Africa and Australia. The methods used vary, but in general, the fruit is spread out on trays in drying yards in the hot sun. In order to prevent darkening, pears, peaches and apricots are exposed to the fumes of burning sulphur before drying. Plums, for making prunes, and certain varieties of grapes for making raisins and currants, are dipped in an alkaline solution in order to crack the skins of the fruit slightly and remove their wax coating, so increasing the rate of drying. Nowadays most foods are dried mechanically. The conventional method of such dehydration is to put food in chambers through which hot air is blown at temperatures of about 110℃ at entry to about 43℃ at exit. This is the usual method for drying such things as vegetables, minced meat, and fish. Liquids such as milk, coffee, tea, soups and eggs may be dried by pouring them over a heated horizontal steel cylinder or by spraying them into a chamber through which a current of hot air passes. In the first case, the dried material is scraped off the roller as a thin film which is then broken up into small, though still relatively coarse flakes. In the second process it falls to the bottom of the chamber as a fine powder. Where recognizable pieces of meat and vegetables are required, as in soup, the ingredients are dried separately and then mixed. Dried foods take up less room and weigh less than the same food packed in cans or frozen, and they do not need to be stored in special conditions. For these reasons they are invaluable to climbers, explorers and soldiers in battle, who have little storage space. They are also popular with housewives because it takes so little time to cook them. Usually it is just a case of replacing the dried-out moisture with boiling water. Questions: 1．What makes food go bad according to the passage? 2．What does the word “dehydration” in Para. 4 refer to? 3．Housewives like dried foods because______. 4．What kind of treatment do pears and plums go through in the drying process? 5．Where are vegetables most commonly dried nowadays?
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将磁极挂装到位后，把两根长键的斜面均匀地涂上一薄层白铅油，按（）对号插入键槽。
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冷轧板带钢的优势有哪些？
“神助拳，义和团，只因鬼子闹中原。挑铁道，把线砍，旋再破坏大轮船。大法国，心胆寒。英美俄德哭连连，一概鬼子都杀尽，大清一统庆升平。”下列对此揭帖主旨概括最完整准确的是（）
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2000年1月13日，某地一家医院报告2例疑似肉毒中毒的患者。2名患者均为男性，分别于1月5日、6日出现症状，临床表现为眼睑下垂、复视、吞咽困难、呼吸困难。提示：与病例和其他司机的面谈形成了爆发假设。同一公交线路的早班司机在终点站餐厅用餐是病例唯一共同的暴露因素。同一线路的下午班和晚班的司机没有发生肉毒中毒，他们通常不在终点站餐厅用餐。调查者假定爆发局限于早班司机，起因为1月3日至7日之间在特定公交线路终点站餐厅进食。适用于本案验证假设的调查方法有（）
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