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
百度试题 结果1 题目2. The air we breathe contains about 21%oxygen (氧气). 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
Air contains about 78 percent nitrogen and 21 percent oxygen, with the remaining part being made up of argon, carbon dioxide, neon, helium, and other gases. The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. ...
Air is an abiotic factor that contains ___. A. oxygen and carbon dioxide B. water and sunlight C. plants and animals D. none of the above 相关知识点: 试题来源: 解析 A。解析:空气是一种非生物因素,它包含氧气和二氧化碳。考查对空气成分的了解。反馈...
State whether the following statement is true or false. Oxygen diffuses about 20 times faster than carbon dioxide. Oxygen is much less abundant in water than in air. Air contains 21% oxygen, but the oxygen content in water is only 0.001%. What factors (physical and biological) can affect ...
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] ...
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%...
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: ...
Air, mixture of gases comprising the Earth’s atmosphere. The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are variable in both space and time. The atmospheric gases of steady concentration (and
Air contains approximately 21% oxygen and 79% nitrogen. In this case, the reaction for complete combustion becomes: CH4+ 2O2+ 7.53N2→ CO2+ 2H2O + 7.53 N2+ Heat (1,013 Btu/ft.3) The amount of air required will vary depending on the type of fuel. Ideally, you would like to add ...