Air is a mixture of different gases. What is the main component of air? A. Oxygen. B. Nitrogen. C. Carbon dioxide. D. Hydrogen. 相关知识点: 试题来源: 解析 B。解析:空气的主要成分是氮气。选项 A 氧气不是主要成分;选项 C 二氧化碳含量很少;选项 D 氢气不是空气的主要成分。
Is oxygen a homogeneous mixture?Question:Is oxygen a homogeneous mixture?Homogeneous MixturesA homogeneous mixture is a combination of more than one substance. It's 'homogeneous' because the substances are distributed evenly throughout the mixture.Answer...
本题考查定语从句,先行词是air。,本句可分为两个单句: Air is a mixture of gases(空气一种气体混合物),和 Oxygen forms 21% by volume of air(氧气按体积占空气的21%),of表示范围,which代指ai,rin 表示地点或时间,to表示方向,by表示方式,所以答案是D ...
aAir is a mixture of gases, consists mainly of nitrogen and oxygen, by volume, about 78% of the nitrogen in the air, oxygen and inert gas accounted for 21%, accounted for 0.94, accounting for about 0.03 of the carbon dioxide, water vapor and impurity accounted for about 0.03 of the. ...
英语语法问题We have learned that air is a mixture of gases,___oxygen,water,vapor and carbon dioxide are the most important for what they do.A.whoseB.in whichC.of whichD.where答案选的是C,想问下为什么不能选D,另外介词为什么
Air is a mixture of gases. Which gas is essential for combustion? A. Oxygen. B. Nitrogen. C. Carbon dioxide. D. Hydrogen. 相关知识点: 试题来源: 解析 A。氧气是燃烧必需的气体。B 选项氮气不是燃烧必需的;C 选项二氧化碳不是燃烧必需的;D 选项氢气不是空气中主要成分也不是燃烧必需来自空气。
aAir is a mixture of gas,of which oxygen forms 2l% by volume. 空气是气体混合物,其中氧气由容量形成2l%。[translate]
4 Air is a mixture of gases.(a)State the percentage of clean dry air which is oxygen. Give your answer to the nearest whole number...%[1](b)Oxygen and nitrogen are useful gases that can be obtained from air.(i) Name the process used to separate oxygen and nitrogen from liquid air...
Answer to: Air is mainly a mixture of nitrogen and oxygen, with small amounts of other gases such as argon and carbon dioxide. What property could...
Further, oxygen leakage is minimized by connecting the modular oxygen-providing assembly at a point of the respiration circuit of the greater respiration apparatus that is downstream from a valving arrangement normally used for venting patient exhaust flow and for controlling system pressure by venting ...