As altitude increases, the amount of oxygen in the air declines due to the falling partial pressure. A mountaineering friend once told me that atop Mount Qomolangma, which stands at 8,848.86 meters, the amount of oxygen in the air is about one-third of that at sea level. In Lhasa, at ...
Air pollution is often measured by the amount of ___ in the air. A. oxygen B. nitrogen C. pollutants D. helium 相关知识点: 试题来源: 解析 C。解析:本题考查空气污染的测量相关知识。pollutants污染物,空气污染通常是通过空气中污染物的量来衡量的。oxygen氧气、nitrogen氮气、helium氦气都是空气的正...
Humidity is an abiotic factor that refers to the amount of ___ in the air. A. oxygen B. water vapor C. carbon dioxide D. none of the above 相关知识点: 试题来源: 解析 B。解析:湿度是一种非生物因素,它指的是空气中水蒸气的含量。考查对湿度概念的理解。反馈...
3. An initial investigation showed the poisoning might be caused by nitrite, which can lead to deficiency in the amount of oxygen reaching human's body tissues. 4. The small canyon is a perfect place for scientific expedition and education, and also a natural oxygen bar and summer resort wit...
In addition to reducing the amount of oxygen in the a___, we also fill our air with pollution that makes it hard to breathe. 相关知识点: 试题来源: 解析 答案: atmosphere.考查首字母填空,句意:除了减少大气中的氧气,我们还把空气充满污染,使呼吸困难.atmosphere是名词"大气,大气层".in the ...
aIn the second case, the amount of oxygen in the calculations corresponds to the total heat demand for preheating the feed and SR. 在第二个案件,相当数量氧气在演算对应于对预先加热饲料和SR的变浓热需求。[translate]
Automobiles and trucks consume a major portion of the energy used fortransportation in the US. They generate a significant amount of the emissions thatcontribute to air pollution. During the past few years, research on cleaner burningalternate fuels has been aimed at improving engine efficiencies and...
PURPOSE: An oxygen generator for an air conditioner is provided to add inertia for air flow in an oxygen supply module by pressing air toward a suction hole and pumping the air to a discharge hole, thereby increasing the air ventilation amount. CONSTITUTION: An oxygen generator for an air con...
When required in tonnage quantities, oxygen is prepared by the fractionaldistillationof liquid air. Of the main components of air, oxygen has the highest boiling point and therefore is lessvolatilethannitrogenandargon. The process takes advantage of the fact that when a compressed gas is allowed ...