亚洲一区二区无码影院,私人影院aaaa毛片,《诱人的护士bd》在线观看

相關推薦

2017年6月英語六級備考精品閱讀試題

　　unhappy, knife may be sharpened on a stone. the one who is, won't, go to school.以下是小編為大家搜索整理的2017年6月英語六級備考精品閱讀試題，希望對正在關注的您有所幫助!更多精彩內容請及時關注我們應屆畢業生考試網!

2017年6月英語六級備考精品閱讀試題

　　The difference between a liquid and a gas is obvious under the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fill it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the 11 available; it must therefore be kept in a closed container or held by a gravitational field, as in the 12 of a planet's atmosphere. The distinction was a 13 feature of early theories describing the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be "dissolved" in a vapor without losing its identity, and another theory 14 that the two phases are made up of different kinds of molecules. The theories now prevailing take a quite different approach by emphasizing what liquids and gases have in 15 They are both forms of matter that have no 16 structure, and they both flow readily.

　　The fundamental similarity of liquids and gases becomes clearly apparent when the temperature and pressure are 17 somewhat. Suppose a closed container 18 filled with a liquid is heated. The liquid expands, or in other words becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes denser as the evaporated molecules are 19 to it. The combination of temperature and pressure at which the densities become 20 is called the critical point.

　　A. added

　　B. case

　　C. prominent

　　D. held

　　E. equal

　　F. partially

　　G. example

　　H. previous

　　I. space

　　J, lifted

　　K. permanent

　　L. particularly