The atmosphere is mainly composed of nitrogen and oxygen. What percentage of the atmosphere is nitrogen? A. 21% B. 78% C. 99% D. 50% 相关知识点: 试题来源: 解析 B。解析:大气层主要由氮气和氧气组成,其中氮气约占 78%,氧气约占 21%。
The exploration of Mars has attracted a lot of attention. What is the atmosphere of Mars mainly composed of? A. Oxygen and nitrogen B. Carbon dioxide C. Hydrogen and helium D. Methane 相关知识点: 试题来源: 解析 B。火星的大气层主要由二氧化碳组成。选项 A 氧气和氮气不是火星大气层主要成...
What percent of the atmosphere is made of nitrogen? How many kilograms of oxygen are in a room that measures 10.0 ft X 10.0 ft and has an 8.00 ft ceiling if the air in the room is 21.00% oxygen by ...
1. Determine the Percentage of Oxygen in Air: - The composition of air is made up of various gases. The most significant component is nitrogen, which makes up about 78% of the atmosphere. Oxygen is the second most abundant gas in air. - The percentage of oxygen in air is approximately ...
The atmosphere is essential to all living things. ___it, the earth would be as cold and lifeless as the ___of the moon.’ ‘The trouble is that our atmosphere ___changing because weare polluting it with chemicals—in the form of gases—and it is keeping in to...
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...
百度试题 结果1 题目( A )10. Is oxygen the only gas ___ helps fire burn? A. that B./ C. which D. what 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
这个句子的主语是water,谓语是will continue to be,表语是what it is today,补语是next in importance to oxygen.what 在句子中表示"什么的样子"就像She is no longer what she was ten years ago.她不再是十年前的样子了.as 不能引导表语从句.而how 是作状语,表示怎样.which指哪一个...
Heat generated by consumption of 1 liter of oxygen when food is oxidized
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...