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
Air contains oxygen and carbon dioxide, ___ are very important to human beings.F. one of whichG. both of whichH. both of thatI. that 相关知识点: 试题来源: 解析 G 这是一个非限制性定语从句,先行词是 “oxygen and carbon dioxide”(氧气和二氧化碳) 。选项 F “one of which” 表示 “其中...
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%...
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]...
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: ...
as well as mortality rate. Health issues would include ones such as all manner of respiratory ailments, with chronic obstructive pulmonary disease (COPD) very likely to develop, which contains within it a number of respiratory ailments such as pneumonia, bronchitis, emphysema and aggravated asthma ...
阅读理解 Looking for a new weight loss plan? Try living on the top of a mountain.Mountain air contains less oxygen than air at lower altitudes so breathing it causes the heart to beat faster and
Bad (or poor) air qualitymeans the air contains one or several pollutants in amounts that are hazardous to our lungs and overall health. Pollution in different forms causes poor air quality Poor air quality is polluted air, and there are many sources that contribute to air pollution: ...
It is because smoke contains many small poisonous soils and gases. So inorder to keep healthy we have to go out to the countryside to breathe more fresh air. Or we can go up hills to get more fresh air. 参考译文: 没有空气就意味着死亡。虽然我们看不见它,我们有空气。空气无处不在,它让...
aDo not operate a compressor in a closed loop on air or any other gas that contains a combustible amount of oxygen. If such loops are unavoidable during prestart checks,use an inert gas such as helium, nitrogen or carbon dioxide depending on the required molecular weight. 不要操作一台压缩机...