题目内容

From about the middle of the 5th century, three Germanic tribes came to England and formed the basis of the modern British people. Which one is not included?

A. the Angles, Saxons and Jutes
B. Saxons and Jutes
Celts
D. Jutes

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The full name of UK is _____ .

A. The Kingdom of Great Britain and Northern Ireland
B. The United Kingdom of Great Britain and Ireland
C. The United Kingdom of Great Britain
D. The United Kingdom of Great Britain and Northern Ireland

在500℃时,MgCO3(s)与其分解产物MgO(s)、CO2(g)组成的平衡系统中( )

A. C=2、P=3、F=1
B. C=2、P=3、F=0
C=3、P=2、F=0
D. C=3、P=3、F=1

关于临界状态的的描述,不正确的是( )

A. 在临界状态气、液之间没有区别
B. 临界点处等温线的一阶、二阶偏导数均为零
C. 临界温度越低的物质,其气体越易液化
D. 临界温度越高的物质,其气体越易液化

溶液的表面层对溶质发生吸附,当表面浓度小于本体浓度,则( )

A. 称为正吸附,与纯溶剂相比,溶液的表面张力γ降低
B. 称为无吸附,与纯溶剂相比,溶液的表面张力γ不变
C. 称为负吸附,与纯溶剂相比,溶液的表面张力γ升高
D. 称为负吸附,与纯溶剂相比,溶液的表面张力γ降低

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