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 ...
百度试题 结果1 题目Air is a mixture of g ___.相关知识点: 试题来源: 解析 gases 反馈 收藏
百度试题 结果1 题目请判断译文是否恰当:Air is a mixture of gases.译文:空气是多种气体的混合物。A、正确B、错误 相关知识点: 试题来源: 解析 正确 反馈 收藏
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。
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。
百度试题 结果1 题目Air is a mixture of g ___.相关知识点: 试题来源: 解析 答案:gases.介词后接名词作宾语;gas是可数名词,根据语境要用复数形式。故填:gases。反馈 收藏
Air is a mixture of gases that you breathe.You cannot see,smell or taste air but it is around you.Layers of air surround theearth,too,making up the earth''s atmosphere.Oxygen is a gas found in the air ,All animals including humans ,need it to stayaliveNitrogen and oxygen are the two...
Air is a mixture of gase(a) Slate the percantage of clean dry air whichis oxygun. Give your answer to the nearesit whole(b) Oxygen and nitrogen are useful gases that can be obtained from ai(c)Carbon dioxide, CO2, is a covalent molecule ...
解析 1.答案:Air is a mixture of gases.2.翻译:空气是各种气体的混合体.3.mixture是名词,意思是“混合体/混合物”.结果一 题目 根据句意及首字母提示填空:Air is a m ___of gases 答案 1.答案:Air is a mixture of gases.2.翻译:空气是各种气体的混合体.3.mixture是名词,意思是“混合体/混合物”...
Air is a mixture of gases ,___ oxygen forms 21% by volume.in which to which by w