问题
单项选择题
在汽液平衡的物系中，任一组分的汽相组成与液相组成之比，称为这一组分的（）
A.相对挥发度
B.活度
C.相平衡常数
D.逸度
答案
参考答案：C
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在汽液平衡的物系中，任一组分的汽相组成与液相组成之比，称为这一组分的（）
A.相对挥发度
B.活度
C.相平衡常数
D.逸度
参考答案：C
When July comes, children know they’ll have the  ir examinations and the school year will __36__ soon.Boys and girls will have nearly a two-month holiday, and they’ll leave school __37__train or by car to __38__ their parents. The summer holidays are the __39__ time of the year for most children. The weather is usually good, so children can spend most of their time __40__ outside. If one lives in the countryside, he can go and play in the woods or in the fields. If he __41__ in a big town, he can usually go to the park to play. The best place for children to spend their summer holidays is the __42__. Some children are lucky enough to live near the sea. __43__ for those who do not live there, if they have the luck to stay in one of the big seaside towns for a week or  two, they’ll __44__ it all the following school year.Now, __45__ makes children like the seaside so much? I think they are the sand, the sea and the sun. The feelings of the sand under their feet, salt water on their skin, and the warm sun on
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