A. Silicon atoms. B. Carbon atoms. C. Oxygen atoms. D. Hydrogen atoms. 相关知识点: 试题来源: 解析 B。解析:文章中明确提到“Graphene is an extremely thin and strong material. It is made up of a single layer of carbon atoms arranged in a hexagonal lattice.”,石墨烯是由一层碳原子组成...
解析 A [解析]答案A 解析:考查定语从句.先行词 gas ,helps fire burn是定语从句,关系词在定语从句中做主语,指物,又因为先行词被the only修饰,故用that. 故选:A. 氧气是能帮助火燃烧的唯一气体. 当先行词被the only,the very,the same等修饰时,只能用that不用which....
Photosynthesis is a chemical reaction in which water (H2O) and carbon dioxide (CO2) chemically react to form the simple sugar glucose (C6H12O6) and oxygen gas (O2). What mass of oxygen gas is produced by the reaction of 5.2 g of water? Be...
答案解析 查看更多优质解析 解答一 举报 A 考查定语从句。Gas为先行词,在定从___ helps fire burn中作主语,且that作主语时不可省略。所以选A。 解析看不懂?免费查看同类题视频解析查看解答 特别推荐 热点考点 2022年高考真题试卷汇总 2022年高中期中试卷汇总 2022年高中期末试卷汇总 2022年高中月考试卷汇总...
A 考查定语从句。Gas为先行词，在定从___ helps fire burn中作主语，且that作主语时不可省略。所以选A。
Human facial expressions differ from those of animals in the degree ___ they can be controlled on purpose. (2007重庆卷) A. with which B. to which C. of which D. for which结果一 题目 Is oxygen the only gas helps fire burn? A.thatB./C.whichD.it 答案 A此句为定语从句,当先行词ga...
解析 A核心短语/词汇:help sb./ sth. (to) do sth. 帮助某人/某物做某事句子译文:氧气是唯一的助燃气体吗? 本题考查定语从句。___helps fire burn 用来修饰之前的名词gas, 该从句的引导词在定语从句中做主语,不能省略,先行词有only 修饰时不能用which; what 不能引导定语从句,故选项A符合题意。反馈...
What volume of SO2 will result from the complete burning of sulfur in 8 L of oxygen? If a 1.75 g sample of lead(II) oxide is decomposed, what volume of oxygen gas will be produced at STP? What volume of oxygen is needed to react with solid sulfur to form 6.20 L of sulfur ...
The Greenhouse Effect may cause the level of the sea to rise and drown cities and even whole countries. The writers tell us that 'ozone is a gas which occurs 20-50 kmabove the ground. It __11___ an essential ___12___ layer around the earth. Without it, t...
What is oxygen 16 used for in climatology? What are two sources of carbon dioxide in air? What is the air pressure in the stratosphere? What is the biosphere? What does the stratosphere contain? Which greenhouse gas is created by humans exclusively? What is AQI? What is anticyclone in mete...