首页
登录
职称英语
The difference between a liquid and a gas is obvious【C1】______the conditions
The difference between a liquid and a gas is obvious【C1】______the conditions
游客
2023-10-13
33
管理
问题
The difference between a liquid and a gas is obvious【C1】______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【C2】______be kept in a closed container, as in the 【C3】______of a planet’s atmosphere. The distinction was a prominent feature of early theories 【C4】______(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【C5】t______a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter【C6】______have no permanent structure, and they both flow easily. They are fluids.
The【C7】______(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【C8】______, 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【C9】______ which the densities become equal is called the critical point. Above the critical point the liquid and the gas can no longer be【C10】______(distinguish): there is a single, undifferentiated fluid phase of uniform density. [br] 【C4】
选项
答案
describing
解析
本句中的describe的逻辑主语为theories,故应用现在分词。同时,describe这一动作只说明一种事实,并不与其他动词作时间上的先后比较,不必用完成时。
转载请注明原文地址:https://tihaiku.com/zcyy/3093516.html
相关试题推荐
Travelbetweentimezonesmay_________evidentdisturbancesinnormalsleeppat
MybestfriendandI________ourdifferencesindifferentways.Iliketotalk
实际上,孩子们与父母之间的分歧并不像我们想象的那样大。(expect)Infact.thegapbetweenchildrenandtheir
Thereisunfortunatelya______betweenthepettycashslipsandtheactualmone
Itisinterestingtoreflectforamomentuponthedifferencesintheareas
Itisinterestingtoreflectforamomentuponthedifferencesintheareas
Renaissancewasthetransitionalperiodbetweenthe______and______.A、Primitiv
Collisionbetweenanaircraftandoneormorebirdsistermedabird-strike.
Collisionbetweenanaircraftandoneormorebirdsistermedabird-strike.
Collisionbetweenanaircraftandoneormorebirdsistermedabird-strike.
随机试题
TwoCulturalDimensionsCultureisthecollectiveprogrammingofthemindwhich
OnehundredandthirteenmillionAmericanshaveatleastonebankissuedcred
女性,45岁,间歇性发作咽下困难3个月,可因情绪波动诱发。食管造影未见异常。如果
青霉素G的不良反应不包括A、过敏性休克 B、溶血性贫血 C、粒细胞减少 D
我国《中华人民共和国合同法》规定,当事人订立合同的形式包括()形式。A、
两根同样长的蜡烛,点完粗蜡烛要3小时,点完细蜡烛要1小时。同时点燃两根蜡烛,一段
孕妇患急性肾盂肾炎应首选A.青霉素 B.氨苄西林 C.红霉素 D.四环素
保持廉洁主要靠会计人员的()。A、舆论压力 B、觉悟 C、良知 D、道德水
(2016年)水体中DO浓度实测值小于水功能区标准浓度限值,下列DO的标准指数值
某城市高架桥上部结构为钢筋混凝土预应力简支梁,下部结构采用独柱式T形桥墩,钻孔灌
最新回复
(
0
)