有机物反应活性（organic reactivity）
有机物反应活性（organic reactivity）
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共用题干Organic Food:Why?1 Europe is now the biggest market for organic food in the world,expanding by 25 percent a year over the past 10 years.So what is the attraction of organic food for some people?The really important thing is that organic sounds more"natural".Eating organic is a way of defining oneself as natural,good,caring, different from the junk-food-eating masses.2 Unlike conventional farming,the organic approach means farming with natural,rather than man- made , fertilisers and pesticides. Techniques such as crop rotation（轮种）improve soil quality and help organic farmers compensate for the absence of man-made chemicals.As a method of food production,organic is,however,inefficient in its use of labour and land;there are severe limits to how much food can be pro- duced.Also,the environmental benefits of not using artificial fertilisers are tiny compared with the amount of carbon dioxide emitted（排放）by transporting food.3 Organic farming is often claimed to be safer than conventional farming. Yet studies into organic farming worldwide continue to reject this claim.An extensive review by the UK Food Standards Agency found that there was no statistically significant difference between organic and conventional crops.Even where re- sults indicated there was evidence of a difference,the reviewers found no sign that these differences wouldhave any noticeable effect on health.4 The simplistic claim that organic food is more nutritious than conventional food was always likely to be misleading. Food is a natural product,and the health value of different foods will vary for a number of rea- sons,including freshness,the way the food is cooked,the type of soil it is grown in,the amount of sunlight and rain crops have received,and so'on.Likewise,the flavour of a carrot has less to do with whether it was fertilised with manure（粪便）or something out of a plastic sack than with the variety of carrot and how long ago it was dug up.5 The notion that organic food is safer than"normal"food is also contradicted by the fact that many of our most common foods are full of natural toxins（毒素）.As one research expert says: "People think that the more natural something is,the better it is for them.That is simply not the case.In fact,it is the opposite that is true:the closer a plant is to its natural state,the more likely it is that it will poison you.Naturally, many plants do not want to be eaten,so we have spent 10,000 years developing agriculture and breeding out harmful traits from crops."Paragraph 1_______A:Factors That Affect Food Health ValueB:Main Reason for the Popularity of Organic FoodC:Testing the Taste of Organic FoodD:Research Into Whether Organic Food is BetterE:Necessity to Remove Hidden Dangers From FoodF:Description of Organic Farming
活性污泥法中的需氧量计算需要考虑( )。A、有机物氧化需氧量和活性污泥自身氧化需氧量B、有机物氧化需氧量和混合液表面散氧量C、有机物氧化需氧量和剩余污泥消化需氧量D、延时曝气活性污泥法中只需考虑有机物氧化需氧量
下列关于活性污泥法的描述中哪项是错误的（）A、活性污泥法处理系统实质上是人工强化模拟自然界水体自净系统B、混合液中含有足够的溶解氧是活性污泥法处理系统必要的运行条件C、活性污泥净化的过程主要是由物理、化学和物理化学反应过程组成D、有机物从污水中去除过程的实质，就是有机物作为营养物质被活性污泥微生物摄取、代谢与利用的过程
在有机物分子中，若某个碳原子连接着四个不同的原子或原子团，这种碳原子称为“手性碳原子”，凡是有一个手性碳原子的物质一定具有光学活性。 例如，有机化合物H有光学活性，分别发生下列反应： ①与乙酸发生酯化反应 ②与NAOH水溶液共热 ③与银氨溶液作用 ④在催化剂的作用下与H2作用，生成的有机物无光学活性的是：（）A、①②B、②③C、②④D、③④
使用读秀图书搜索（http://www.duxiu.com/），查找2009年出版的书名中有“organic chemistry”的中文图书（）。 A、《有机化学 Organic chemistry eng》B、《有机化学 Organic chemistry 中文版 eng》C、《有机化学中的光谱方法 ORGANIC 6TH EDITION CHEMISTRY》D、《Organic Chemistry有机化学》
下列关于X射线机相关指标中英文对照不正确的是（）。A、材料分辨力-grayleveldifferentiationB、灰度分辨力-organic/inorganicdifferentiationC、有用有机物分辨力-usefulpenetrationD、空间分辨力-spatialresolution
挥发性有机物指常温常压下能够挥发或气态的有机物，世界卫生组织（WHO，1989）定义熔点低于室温、沸点在（）℃之间的有机物为挥发性有机物，英文Volatile Organic Compounds，简写为VOCs。
填空题挥发性有机物指常温常压下能够挥发或气态的有机物，世界卫生组织（WHO，1989）定义熔点低于室温、沸点在（）℃之间的有机物为挥发性有机物，英文Volatile Organic Compounds，简写为VOCs。
单选题在有机物分子中，若某个碳原子连接着四个不同的原子或原子团，这种碳原子称为“手性碳原子”，凡是有一个手性碳原子的物质一定具有光学活性。 例如，有机化合物H有光学活性，分别发生下列反应： ①与乙酸发生酯化反应 ②与NAOH水溶液共热 ③与银氨溶液作用 ④在催化剂的作用下与H2作用，生成的有机物无光学活性的是：（）A①②B②③C②④D③④
多选题下列关于活性污泥反应动力学的叙述中，哪几项正确？（）A米—门公式是理论公式，表述了有机物在准稳态酶促反应条件下，有机物的反应速率B莫诺特方程是实验公式，利用纯种微生物在复杂底物培养基中进行增值殖试验，表述了微生物比增殖速率与有机物（底物）浓度关系C劳—麦方程以微生物的增殖速率及其对有机物的利用为基础，提出了单位有机物降解速率的概念D活性污泥反应动力学模型的推导，通常都假定进入曝气反应池的原污泥中不含活性污泥
单选题活性污泥处于对数增长阶段时，其增长速率与（）呈一级反应。A微生物量B有机物浓度C溶解氧浓度D温度