百度试题 结果1 题目 4. It's the mixture of gases(气体的混合物). It surrounds the earth. We breathe in it every day. We can't live without it. It's air. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
The air we breathe in is actually a m___ of different gases, such as oxygen, hydrogen and so on. 答案 答案:mixture.mixture表示"混合物",不定冠词a后接单数可数名词.故填mixture.我们吸入的空气实际上是不同气体的混合物,比如氧气,氢气等.相关推荐 1The air we breathe in is actually a m___ ...
The air we breathe is a mixture of gases. What is air? A. A liquid B. A gas C. A solid D. A powder 相关知识点: 试题来源: 解析 B。我们呼吸的空气是气体的混合物。选项 A 液体错误;选项 C 固体错误;选项 D 粉末错误。反馈 收藏 ...
B Air is the mixture of gases that you breathe. You cannot see, smell or taste air but it is around you. Layers of air surround the earth, too, making up the earth's atmosphere. Oxygen is a gas found in the air. All animals,including humans, need it to stay alive.Nitrogen and ox...
A science book said that air is made up of different gases. We can breathe air because it contains ___. A. oxygen B. carbon dioxide C. nitrogen D. helium 相关知识点: 试题来源: 解析 A。解析:我们能呼吸空气是因为空气中含有氧气。B 选项二氧化碳不能供人呼吸;C 选项氮气也不是呼吸的主...
百度试题 结果1 题目4.Air,we breathe every day, is made up of oxygen. nitrogen and other gases. A. that B. which C. what D. where 相关知识点: 试题来源: 解析 4.B 【解析】which在此处引导非限制性定语从句 且在从句中作宾语 反馈 收藏 ...
The air we breathe on the surface is a mixture of several gases including oxygen, nitrogen, argon, carbon dioxide, and other gases in trace amounts. We breathe easiest with 21% oxygen present in the air. When other gases contaminant the air, the oxygen levels drop, and that is when the...
百度试题 结果1 题目Air,___we breathe everyday, is made up of oxygen, nitrogen and other gases.相关知识点: 试题来源: 解析 Those at the desk want to buy tickets write down your names.反馈 收藏
The creation of the Davy lamp in 1815 was to spark our continual awareness regarding the impact of gas and chemical pollution.doi:HUMPHRY DAVYStephensBorg, KeithJournal of Perioperative Practice
A gas is matter in which the molecules are widely separated, move around freely, and move at high speeds. Examples of solids include the gases we breathe (nitrogen, oxygen, and others), the helium in balloons, and steam (water vapor)....