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
22 Air entering human lungs contains approximately 21% oxygen and 0.04% carbon dioxide Which row shows the concentrations of these gases in air leaving the lungs?percentage of percentage of Coxygen carbon dioxide in expired air in expired air A421.0B124.0C164.0D200.4 相关知识点: 试题来源: ...
atmosphere and earth's crust is composed of nitrogen. Because rain droplets pass through the atmosphere on their way to the ground, rainwater also contains nitrogen in varying amounts. Although nitrogen is not a major component of oceans
Fill in the blanks. Even though the barometric pressure decreases with the altitude, the ___ of all the atmospheric gases remains the ___ at both high and low elevations. In other words, the percentage of oxygen is always about 21percent-both a Fill in the blanks...
What percentage of water and oxygen is there on planet earth?The average amount of gas that moves in and out of the lungs during a normal breathing cycle is ___ liter. a. 1.0 b. 0.5 c. 4.2 d. 5.7 e. 2.5Oxygen is much less abundant in water than in air. Air c...
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...
Weknow that, air contains the gases like nitrogen, oxygen, carbon dioxide and other trace gases. As our nose cannot filter oxygen from other gases, we inhale the same mixture of air. When we exhale out, the air with the same composition will be given out, but the percentage of carbon ...
155K Learn what gases make up the atmosphere. Identify the components of the atmosphere and understand the significance of the composition of gases in Earth's air. Related to this QuestionWhat is the percentage of oxygen contained in air? What is the density of oxygen? What percent of the...
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%...
Porous carbon materials have the great advantage of a hierarchal arrangement of pores which can facilitate high surface area, conductivity, and ease of oxygen/air diffusion through it. Hence, it was expected that this would improve the discharge capacity. Due to the systematic ordered nature of th...