亚甲基蓝分光光度法测定水中硫化物时,样品采集很关键,由于硫离子很容易被氧化,硫化氢易

题型:单项选择题

问题:

亚甲基蓝分光光度法测定水中硫化物时,样品采集很关键,由于硫离子很容易被氧化,硫化氢易从水中逸出,因此在采集时应()。

A.防止曝气

B.注意安全

C.将水样装半瓶

考点:环境监测上岗考试环境监测上岗考试题库
题型:单项选择题

For the most part, schools are designed to produce people who fit into society, not people who set out to change it. However, schools, particularly universities, may not only spread culture; they may add to the cultural heritage(遗产). Today American society places a good deal of emphasis on the development of new knowledge, especially in the physical and biological sciences , medicine, and engineering. In the recent years, the nation’s leading universities have increasingly become research centers.

An emphasis(强调)on research has led universities to judge professors not by abilities as teachers, but as researcher. promotions(提升), salary increases , and other benefits have long been dependent on research and publication. However, the most important is no longer publishing. To be successful these days, professors have to bring in money provided by government and private industry. Critics claim that academic(学术) success is most likely to come to those who have learned to“ignore”their teaching duties to pursue research activities. Defenders say that even when students themselves are not involved in research projects they benefit from such an emphasis on research.

Major research universities like the Massachustts Institute of Technology have also cooperated with industrial companies to develop technology and products with commercial potential(潜能).With university-industry ties continuing to grow, debate(辩论)has increased about the consequences for basic science, academic openness, the control of information, the direction of research, and the influence on students.

1. According to the passage, which of the following is NOT emphasized by today’s American society?

A. Physical science.          B. Biological science.

C. Engineering.            D. Computer science.

2. In the present standard, a successful professor is one who can____.

A. teach well             

B. get financial support for research

C. get the highest salary    

D. have many publications

3. Supporters of the present emphasis on research argue that_____.

A. it involves more students in it.

B. it does good to students anyway.

C. it has a direct good effect on teaching

D. it earns a lot of money for a university

4. The author seems to be_____ the move of emphasis to research.

A. totally against   B. sorry to see      C. in favor of    D. neutral (中立) about

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2010年5月1日~10月31日世博会在上海举行,为了迎接上海世博会,2009年上海采取了多项措施解决大气污染问题,据悉上海市大气污染物中二氧化硫、氮氧化合物、总悬浮颗粒物含量比往年同期分别下降了41%、18%、7%。据此完成23~24题

小题1:下列有关控制上海市大气污染的措施,正确的是(   )

①为机动车加装净化装置并使用清洁燃料 ②植树种草,提高城市绿化覆盖率

③推广使用天然气等清洁能源   ④大量使用石油作为能源,减少煤炭使用量

A.①②③

B.①②④

C.①③④

D.②③④小题2:为防治酸雨上海市也采取了一系列措施,下列属于防治酸雨的措施是(    )

①限制高硫煤的使用②实施西气东输工程③发展清洁煤燃烧技术

④植树造林⑤加强对建筑工地的环境管理

A.①②③

B.④⑤

C.②③④

D.①③⑤

题型:单项选择题

以下均是心肌梗死的临床表现除外()

A.心电图进行性改变

B.血清心肌坏死标记物增高

C.胸骨后剧烈疼痛

D.心悸

E.发热、恶心、呕吐、上腹胀痛

题型:单项选择题

纯合的黄色圆粒豌豆与绿色皱粒豌豆杂交得F1(全部为黄色圆粒),F1自交得F2,F2中杂合的绿色圆粒豌豆占()

A.1/16

B.2/16

C.3/16

D.9/16

题型:单项选择题

电子计算机的发展按其所采用的逻辑器件可分为几个阶段?()

A.2个

B.3个

C.4个

D.5个

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