问题 单项选择题 A1/A2型题

液体微粒分散形成多相体系,聚结和重力不稳定性,分散法制备的液体类型是()

A.溶液剂

B.溶胶剂

C.乳剂

D.混悬剂

E.合剂

答案

参考答案:C

解析:分散体系中液体类型的特征为:溶液剂:分子或离子分散的澄明溶液,体系稳定,溶解法制备;溶胶剂:胶态分散形成多相体系,聚结不稳定性,溶胶法制备;乳剂:液体微粒分散形成多相体系,聚结和重力不稳定性,分散法制备;混悬剂:固体微粒分散形成多相体系,聚结和重力不稳定性,分散法和凝聚法制备。所以答案为C。

改错题

第二节 短文改错(共10小题;每小题1分,满分10分)

此题要求改正所给短文的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:此行多一个词: 把多余的词用斜线( \ ) 划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

Dear Huajian,

I’m very glad to have received a letter you sent me two         76._________

weeks ago. I have been thinking about the question you asked me.  77._________

In my opinion, you should go back after you finish your          78._________

studies abroad. For one reason, which you are studying is badly    79._________

needed nowadays in China. It will be quite easy of you to         80._________

find a good job. In fact, I know a few big company here           81._________

in our city were hoping to hire people like you. For another        82._________

reason, I think it will be very much more convenient             83._________

for you to look after parents as they are getting old.              84._________

Therefore, this is only my point of view. It is up to you to make         85._________ 

a right choice. Besides, I do hope to see you soon.

Regards,

Huaming

多项选择题