A. In the case of B. In case C. In case of D. In event of 相关知识点: 试题来源: 解析 A in case of sth.:假使,如果;in case:以防,万一;in event of:如果,以防;三项都不符合题意。in the cause of意为“在,,过程中”。句意:在化学变化中一种新物质生成了。反馈...
A. Wax turns into water B. Wax combines with oxygen to form carbon dioxide and water C. Wax turns into hydrogen gas D. Wax turns into oxygen gas 相关知识点: 试题来源: 解析 B。解析:蜡烛燃烧时,蜡与氧气发生化学反应,生成二氧化碳和水,这是蜡烛燃烧这个化学变化的本质。选项A蜡不会单纯地变成水...
In a chemical change, there is always a new substance formed.Breaking up water into hydrogen and oxygen is a chemical change.In each of the chemical change at least one new substance is formed.A change is not a chemical change if it doesn’t form a new substance. ...
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The poleward extension of the western Northern Pacific subtropical high may result in the drying trend in southern China and increasing rainfall over the Yangtze River Valley in spring [5]. It may also lead the tropical cyclones to higher latitudes, threatening Northeast Asia. The Hadley Cell ...
Waste heat capturing from chemical/thermal processes in electrical, mechanical and petrochemical industries or plants has been discussed practically and employed in various sectors and industrial processes. Despite the widespread application of waste heat elimination via conventional processes and sources, ...
Have you ever seen a flower change color or noticed how food changes when cooked? These are all examples of chemical reactions that occur due to changes in the arrangement of atoms and molecules. Pharmaceuticals Chemistry plays a crucial role in the development of new medicines. Pharmaceutical com...
Recently,Rambouillet,a small historic French town,has teamed up with a company called Glowee to turn the city into a full-scale bioluminescence laboratory.The goal is to change the way in which cities use light.The company uses marine (海的) bacteria harvested from the coast o...
2 If you tell a librarian what you’ve read before and what you liked or disliked about it, they will suggest some possible books for you to try. ◆ Make a change. 3 You may get used to reading history books or you just take an interest in science fictions. What about the books...
Winter is long and very cold. It lasts from October to March. It is dark twenty-four hours a day. The sun does not come up to warm the water and land. When the north winds blow, it is even colder. There are days when the temperature is 50°F below zero. My family is prepared....