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当前学科：危险化学品安全作业
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聚四氟乙烯合金泵采用聚四氟乙烯材料与其他氟塑料经合理配方，特殊工艺模压而成，适用于-85～200℃的介质。（）
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有甲、乙两个投资方案，其中甲方案的项目计算期为5年，净现值为200万元；乙方案的项目计算期为4年，净现值为150万元。在运用最短计算期法进行决策时，乙方案调整后的净现值为（ ）万元。
Facts About FoodEverywhere on earth there are"food specialists"with opposite (or different) opinions on the best kinds of nutrition for various purposes. A lot of people believe that the healthiest diets are high in fiber ,vitamins ,and minerals but low in fat ,cholesterol ,sugar,and salt. Some nutritionists say the perfect eating plan contains mostly carbohydrates without much protein. In contrast , other scientists say people need high-protein meals with meat, chicken , fish , or milk products and only small amounts of grains , potatoes , breads , rice , and noodles. One famous diet plan allows only certain foods at certain times-protein with protein, carbohydrates with carbohydrates , fruits alone , and so on. Some eaters stay away from all meat and maybe even fish and milk products. They get their protein from plants , mostly beans. Others want only high-fiber food. These people may not eat white bread or white rice or even cooked vegetables. So what is the best way to eat and be healthy? The discussion of food facts will go on far into the future.The necessary substances and elements for human life and health are water, protein, carbohydrates ,fats , vitamins, and minerals. Most kinds of food contain some or all of the required nutrients , but these substances have different effects on people. Various ingredients and dishes affect the mind in different ways. and some kinds of nourishment have better effects on the brain than others. For instance. can broccoli increase brain power? Maybe so. Low levels of some of the B vitamins can cause a decrease in memory and thinking ability , nutritionists say, but dark green vegetables , like broccoli , contain a lot of these nutrients. Another example of a"memory helper"is lecithin-a substance from soybeans , also found in high-fiber foods like nuts and whole grains. High-protein foods influence the mind in more helpful ways than dishes high in sugar and carbohydrates. And the caffeine in coffee or tea may help thinking. Of course , its effects don't last long.In many places outside big cities , food with more than four legs is part of good, healthy home cooking. Fried or grilled ants are a tasty but expensive snack in Colombia , South America. In various parts of Mexico , over 300 types of insects serveas food. In southern Africa. many people like to eat at least one kind of caterpillar or worm. They enjoy it fried , dried , or cooked in tomato sauce. In Thailand , cooks create a spicy hot pepper sauce with water bugs. In Vietnam , grasshoppers filled with peanuts are a special dish. And in some regions of China,bugs are not only a part of meals but an important ingredient in medicine too. Most kinds of insects have high nutritional value. They contain a l0t of protein , vitamins , and minerals. Many people like their taste. They are everywhere on the planet. They add to the variety of people' s diets. For several reasons , insects are an important kind of food in the global diet , and they may become a more common ingredient in the future.The growing similarities in diet and eating habits around the world are influencing people of various cultures in different ways. For example, Western foods are damaging health in the industrialized island country of Japan. Instead of small meals of seafood , rice , and vegetables ,the typical Japanese diet ow includes large amounts of meat ,dairy products. And desserts like tiramisu , a rich Italian dish full of chocolate , cheese , and sugar. According to Japanese health researchers , such changes in eating habits are related to a great increase in health problems such as heart disease , strokes , cancer , and diabetes. On the other hand , the changing global diet is having the opposite effect on the people in the Czech Republic. The government of this European nation no longer supports meat and dairy products financially , so the cost of these foods is going up. In contrast , fresh fruits and vegetables are becoming more widely available from private markets and stands. Cooks are even serving salads to schoolchildren ,and families are eating healthier home-cooked meals. For these reasons ,fewer Czech men are having heart attacks , the women are l0sing a l0t of weight , and most people are living healthier lives.Decide whether the following statements are true or false. Write"T"for True and"F"for False on the Answer Sheet.6. The best way to eat is to eat only small amounts of carbohydrates.7. Most kinds of food contain fats , vitamins and minerals.8. High-fiber food like nuts and whole grains can influence people' s memory.9. Four legs insects serve as food in many places in the world.10. Japanese health researchers consider Italian tiramisu is the key factor that relates to health problems in Japan.
细菌通过性菌毛将遗传物质从供体菌转移到受体局的过程，称为
回流比过大会增加水、电的消耗，会造成塔内物料的循环量过大，导致（）。
电影的光比高于电视。()
患者男性，56岁，有糖尿病史7年，心绞痛病史3年。因突然发作胸闷、胸部紧缩感、出汗4小时而急诊入院。血压110/70mmHg，做心电图示胸前导联的ST段压低0.2mV，T波倒置，无病理性Q波。查肌钙蛋白升高。应诊断为（）
可调整钉住 Adjustable peg
下列战机中属于隐形战略轰炸机的是（）。
元朝（）绘的花篮，以篮为架，内设瓷罐，极具特色。
上海市区中心某商务楼的外墙饰面工程，设计要求外观雄伟亮丽①外墙面、圆柱面要求用浅黄色，具有大理石柔和亮丽的质感的材料②材料选A级不燃材料、吸水率小、耐风化耐候性好、耐酸雨③整体较均一色差小。要求从下述材料中，判断和挑选出一种符合上述要求的装饰材料（）。