首页
登录
职称英语
The difference between a liquid and a gas is obvious【46】______the conditions
The difference between a liquid and a gas is obvious【46】______the conditions
游客
2023-10-13
30
管理
问题
The difference between a liquid and a gas is obvious【46】______the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and fills it to the level of a free surface. A gas forms no free surface but tends to diffuse throughout the space available; it must【47】______be kept in a closed container, as in the【48】______of a planet’ s atmosphere. The distinction was a prominent feature of early theories【49】______(describe) 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 held that the two phases are made up of different kinds of molecules (分子). The theories now prevailing【50】 t______a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter【51】______have no permanent structure , and they both flow easily. They are fluids.
The【52】______(fundament) similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat. Suppose a closed container partially filled with a liquid is heated. The liquid expands, or in other【53】______, becomes less dense; some of it evaporates. In contrast, the vapor above the liquid surface becomes dense as the evaporated molecules are added to it. The combination of temperature and pressure【54】______ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be【55】______(distinguish) ; there is a single, undifferentiated fluid phase of uniform density. [br]
选项
答案
at
解析
使液体和气体密度相同的那个状态下的温度和压力被称作临界点。句中的temperature and pressure是先行词,需要一个关系词引导一个定语从句修饰先行词。特定数值的temperature和pressure与at搭配,意为“在某个温度和压力下”。
转载请注明原文地址:https://tihaiku.com/zcyy/3095449.html
相关试题推荐
Thepolicemanlookedme______severaltimesandobviouslydislikedwhathesaw.A、
Acollisionbetweenanaircraftandoneormorebirdsistermedabird-strik
Acollisionbetweenanaircraftandoneormorebirdsistermedabird-strik
Acollisionbetweenanaircraftandoneormorebirdsistermedabird-strik
It’snotliquid,gasorsolid.It’snotananimal,aplantoramineral.It’s
Youshouldtrytomakesome________ofyourdifferencessothatyoucanworktoge
Itisconvenienttodistinguish(区分)betweennonverbalandverbalcommunication,j
Thereisabigdifferencebetweentownlifeand【D1】__________inEngland.
Thereisabigdifferencebetweentownlifeand【D1】__________inEngland.
Thereisabigdifferencebetweentownlifeand【D1】__________inEngland.
随机试题
EARTH’SENERGYCYCLE(1)To
减灾救灾disasterreductionandrescue
EndangeredPeoplesA)Today,itisnotdistance,butculturethatseparate
[originaltext]Manyayoungpersontellsmehewantstobeawriter.Ialwaysen
锚杆、锚碇板和加筋土挡土墙墙背填土的实测项目的关键项目是()。A.锚杆间距
患儿,3岁,饮食异常,精神烦躁,睡眠不安,肛门、会阴部瘙痒。诊断为A.钩虫病
柴胡可以A.养益肝阴B.平肝潜阳C.疏肝破气D.疏肝解郁E.柔肝止痛
应由执业药师指导购买、销售和使用的药品是A.甲类非处方药B.乙类非处方药C.口服
当其他影响血压的因素不变时,下列哪些因素可引起脉压增高?( )A.每搏量增加
社会主义市场经济体制的基础是( )。A、以间接手段为主的完善宏观调控体系 B、
最新回复
(
0
)