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 ...
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 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
Therefore all of the gases in the air breathed by a scuba diver at 40 meters are present at five times their usual pressure. Nitrogen, which composes 80 per cent of the air we breathe, usually causes a balmy feeling of well-being at this pressure. At a depth of 5 atmospheres, ...
Air pollution affects the air we breathe. It is made up of harmful gases, droplets, and particles. These make the air quality(质量) 1 . Many things can cause air pollution. Some air pollution is caused by burning fossil fuels(化石燃料). Oil is used to make gasoline for cars. Cars ...
Passage Two 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...
Air pollution affects the air we breathe. Itis madeup of harmful gases droplets and particles. These makethe air quality(质量)1_. Many things can causeair pollution. Some air pollution is caused by burningfossil fuels(化石燃料). Oil is used to make gasolinefor cars. Cars and trucks 2 a ...
Air pollution affects the air we breathe. It is madeup of harmful gases droplets and paticles. These makethe air quaity(质量)1. Many things can causeair pollution. Some air pollution is caused by burningfossil fuels(化石燃料). Oil is used to make gasolinefor cars. Cars and trucks 2 a ...
1. They the air cool and clean. 它们保持空气凉爽和清洁。 2. They gases from the air and produce oxygen for us to breathe. 它们从空气中吸收有害气体,并产生氧气给我们呼吸。 3. They are air pollution. 它们主要对抗空气污染。 4. I know trees also our lives more convenient. 我知道树木也...
But waste in landfill emits greenhouse gases as it rots, and can poison groundwater.───但是,填埋场中的垃圾在腐烂过程中会释放出温室气体,也会污染地下水。 Waste gases poison the air we breathe. The rivers and lakes are polluted by waste dumped in them from factories.───我们呼吸着有毒的...