题目Air contains ___ which is vital for living things. A. oxygen B. plastic C. cars D. chairs 相关知识点: 试题来源: 解析 A。解析:空气中含有氧气,这对生物至关重要。塑料、汽车和椅子都不是空气中的成分且对生物不是必需的。反馈 收藏
Nitrogen oxides are formed when combustion temperatures are high enough to cause molecularnitrogenin the air to react withoxygen.Stationarysources such as coal-burning power plants are major contributors of this pollutant, althoughgasoline enginesand other mobile sources are also significant. ...
Percentage of viable cells (at t = 1.5 h) after trypsinization of the adhered cells in the inserts, and after cell recovery (t = 20 h) determined by trypan blue dye exclusion method in an automatic viability analyzer (Vi-CELL) (n = 3 independent experiments). ...
aAir is the name given to atmosphere used in breathing and photosynthesis. Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. 空气是名字被给用于呼吸和光合作用的大气。 干燥的空气大致包含(由容量) 78.09%...
This value is a dimensionless number, usually expressed in the range 0 to 1 in most building applications, or as a percentage (0% to 100%), where 1 represents the state of saturation (when the partial vapour pressure is equal to the saturation vapour pressure). When moist air is subjected...
It is very important to know the state of the air as it affects the health of everybody. Earth’s atmosphere mainly comprises of two gases that are essential for life on Earth: nitrogen and oxygen. However, airborne pollutants are also carried in the air that we breathe. The AQI measures...
agot dental caries 得到的龋 [translate] ahard working 坚硬工作 [translate] aAs only about 25% of the air entering the intake is used for combustion, the cooling air contains both oxygen and moisture. 作为大约25%空气进入进水闸为燃烧只使用,冷却空气包含氧气和湿气。 [translate] ...
Oxygen-enriched air containing 30–40% O2 can be used to increase the efficiency of combustion and other oxidation processes. Biochemical processes and organic chemical oxidations also benefit from the use of oxygen-enriched air to increase reaction rates and yields; an advantage of using membrane-...
First of all you might be asking ‘what is Nitrox?’. Quite simply, it’s air with a higher percentage of oxygen than the air we normally breathe. Usually air contains 21% oxygen and 79% nitrogen. Nitrox, orenriched air, commonly blends 32% or 36% oxygen. ...
The difference in O2 concentration between the arterial blood and the air within the alveoli is known as the arterial– alveolar oxygen difference, or gradient, and is abbreviated as Pao2–Pao2. This value reflects the adequacy of gas exchange within the lung. Pao2–Pao2 will widen if diffusion...