问题 问答题 简答题

制备稀释臭气样品所用的无臭清洁气体时应注意什么?

答案

参考答案:

(1)稀释臭气样品所用的无臭清洁气体气袋的充气管内径要稍大于气体净化器供气管外径,既保证气袋定量充满清洁空气,又可防止充气过量、过压而导致气袋破裂。

(2)嗅辨员应对净化空气进行有无气味的嗅辨检验,以便及时更换空气净化系统的活性炭。

(3)应采用无油空气泵向空气净化器供气,严禁使用含油或其他散发气味的供气设备。

单项选择题 A型题
阅读理解

University of Oxford is the oldest university in the English-speaking world and it’s one of the top university in the world. There is no clear date when the university started, but teaching began at Oxford in some forms in 1096 and developed quickly from 1167.

There are 39 independent(独立的) colleges at Oxford, attracting students and learned men from across the world. There are over 100 libraries for the students and learned men to use. At University of Oxford, they also provide a number of money for the best students. Of course, if you want to study here, first you have to reach a certain level of English language.

College life at Oxford is very exciting but busy. The groups of college provide a friendly and welcoming home for students while the college are strict with students about their studies. Many Chinese students are studying here. The number of Chinese students at the university has grown quickly over the past 10 years.

根据短文内容,从A、B、C、D四个选项中选出能回答所提问题或完成所给句子的最佳答案。(共3小题,每小题1.5分,满分4.5分)

小题1:What do you have to do first if you want to ask fir studying at Oxford? You have to________.

A.be independent

B.pass a certain level test of English language

C.study English hard

D.be the best students小题2:How’s the college life at Oxford? It’s full of ________ and has __________.

A.excitement; much school work to do

B.excitement; no school work to do

C.attraction; no school work to do

D.attraction; a little school work to do小题3:What’s the best title for the passage?.

A.The College Life

B.The Famous Learners at Oxford

C.The Chinese Students at Oxford

D.The University of Oxford