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由原文第一段的Air is not jsut one gas. It is a mixture of different gases可知正确答案.故答案为C. (4).【答案】 A 【解析】 由原文第三段的If 1000 dots can represent the air, then 776 of them are nitrogen, 210 are oxygen, 11 are argon可知正确答案.故答案为A.反馈...
For a gaseous mixture of H_2 and H_2O, if the total pressure is 760 mmHg and the vapor pressure of H_2O is 20 mmHg, what is the partial pressure of the H_2 gas? A gas mixture contains each of these gases at the indicated partial pressures: N2, 21...
A mixture can be made by combining two or more substances and physically, not chemically, mixing them together. There are two main types of mixtures: homogeneous and heterogeneous. A homogeneous mixture is also referred to as a solution.
根据第一段第一行“Air is not just one gas,it is a mixture of different gases,空气不仅仅是一种气体,它是不同气体的一个混合 ”可知答案为C,空气是不同气体的一个混合;A项:空气只是一种气体;B项:空气是两或三种气体的混合,第二段第一句提到“空气中主要有四种气体”故B错误;D项:空气不存在。2、...
A hydrocarbon chain is a molecule that consists of entirely hydrogen and carbon. They are the simplest of the organic compounds and may be a liquid, gas or solid. There are many types of hydrocarbon chains, including alkanes, alkenes, alkynes, cycloalkan
根据第一段第一行“Air is not just one gas,it is a mixture of different gases,空气不仅仅是一种气体,它是不同气体的一个混合 ”可知答案为C,空气是不同气体的一个混合;A项:空气只是一种气体;B项:空气是两或三种气体的混合,第二段第一句提到“空气中主要有四种气体”故B错误;D项:空气不存在。2、...
The inert gas is introduced into the space that should be protected from explosion. The presence of the inert gas reduces the oxygen volume fraction below the limiting oxygen concentration (LOC) or the maximum allowable oxygen concentration (MAOC) so that the mixture can no longer ignite. Safety...
Nowadays, the gas you pump from almost every gas station contains a blend of gasoline and ethanol. The percentage of ethanol blend is indicated by the E number. For example E10 means the gas mixture contains 90% gas and 10% ethanol. In automobiles, ethanol fuel won’t do much harm to ...
2.阅读短文,从 A、 B、 C、 D四个选项中选出正确答案。What is air? Air is not just one gas. It is a mixture of different gases. Because we can't see the gases in the air, it is difficult to think about them.There are four main gases in the air: oxygen (氧气) , nitrogen (...