Concentrations of various gases in airPOST a QUESTION or COMMENT about the constituents of air: concentrations of gases in airGases that make up outdoor air: this article provides a table of the components in outdoor air - a list of the various gases found in air by percentage.The...
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Makeup air heater. (what's New).(Brief Article)
百度试题 结果1 题目What makes up about 78% of air? A. Oxygen B. Nitrogen C. Carbon dioxide D. Argon 相关知识点: 试题来源: 解析 B。中文解析:文章中明确提到“Nitrogen makes up about 78% of air.”,氮气占空气的大约 78%。反馈 收藏 ...
You may be wondering how, exactly we know what makes up the sun. After all, no human has ever been there and no spacecraft has ever brought back samples of solar matter. The sun, however, is constantly bathing the earth in electromagnetic radiation and particles released by its fus...
What gases make up trace gases?The Earth's Atmosphere:The atmosphere of the Earth is unique in our solar system as it contains mostly nitrogen gas and is the only atmosphere that also contains significant quantities of molecular oxygen. Most of the other planets in our solar system have high...
What helps the balloon get up in the air?A. Burning gas.B. An electric machine.C. Wind power. 相关知识点: 试题来源: 解析 A 首先,热气球依靠燃烧气体(如丙烷)加热空气,热空气密度低于周围冷空气,从而产生浮力使气球上升。选项A正确。 选项B的电动机器通常用于提供推动力(如螺旋桨),但并非气球升空...
Air pollution occurs when gases, dust particles, fumes (smoke), or odors are introduced into the atmosphere in a way that makes it harmful to humans, animals, and plants. Air pollution results in the air being dirty (contaminated, unclean, and often toxic). ...
Surging:The engine may cough a little bit and start to buck and suddenly rev up. This is a sign that the fuel pump is beginning to suck up air, whether due to a very low level or sloshing in the tank. Breaking Up:This is common when cars run low under hard cornering, such as on...
—Hallows of all ( ) colours! 相关知识点: 试题来源: 解析 the;colours 该题需要根据上下文填入合适的单词。第一空应填入“the”,因为“空气”通常用“the air”表达。第二空应填入“colours”,因为句子描述的是Hallows的颜色。 因此,答案为:the;colours。反馈 收藏 ...