结果1 题目 1.5. Air cannot be called an element because: C A. Air can be separated into oxygen atoms. B. Air is a pure substance. C. Air contains more than one element. D. Air can be liquefied. 相关知识点: 试题来源: 解析 C 反馈 收藏 ...
13. “Air is the very substance of our freedom, the substance of superhuman joy…. aerial joy is freedom.”― Gaston Bachelard 14. “Because forgiveness is like this: a room can be dark because you have closed the windows, you’ve closed the curtains. But the sun is shining outside, ...
a) Air is a heterogenous mixture b) Air is a pure substance, and is made up of N, O, Ar, and C c) Air is a solution, in which nitrogen is the solvent d) Air is a solution, in which nitrogen is the solute Homework Equations None The Attempt at a Solution I put c). Am I ...
The food, pharmaceutical, and biotechnology industries, and hospitals, have centralized air conditioning systems to provide a high-purity production environment. In these places, the air purity level is mandatory to control several problems. Therefore, the market has been subject to a demand for impr...
1. the mixture of gases we breathe; the atmosphere. Mountain air is pure.aire 2. the space above the ground; the sky. Birds fly through the air.aire 3. appearance. The house had an air of neglect.aspecto 4. a tune. She played a simple air on the piano.aire verb1...
Mountain air is pure.aire 2. the space above the ground; the sky. Birds fly through the air.aire 3. appearance. The house had an air of neglect.aspecto 4. a tune. She played a simple air on the piano.aire verb 1. to expose to the air in order to dry or make more fresh etc....
AIR. That fluid transparent substance which surrounds our globe. 2. No property can be had in the air it belongs equally to all men, being indispensable to their existence. To poison or materially to change the air, to the annoyance of the public, is a nuisance. Cro. Cr. 610; 2 Ld....
terms used in the description of oil, natural gas with a high sulfur content is called "sour" while that with a low content is referred to as "sweet" Regardless of the exact composition, natural gas must be refined to remove its impurities; when ready for use, it is nearly pure methane...
Air is a physical mixture of various gases and water vapour. It is composed of nitrogen (78%), oxygen (21%) and 1% of carbon dioxide and inert gases, such as hydrogen, helium, neon, argon and water vapour. Air without any moisture content is called dry air, but this is a pure phys...
Mountain air is pure.aire 2. the space above the ground; the sky. Birds fly through the air.aire 3. appearance. The house had an air of neglect.aspecto 4. a tune. She played a simple air on the piano.aire verb1. to expose to the air in order to dry or make more fresh etc...