用FeCl3溶液腐蚀印刷电路板上铜箔的反应是:2Fe3++Cu = 2Fe2++

题型:选择题

问题:

用FeCl3溶液腐蚀印刷电路板上铜箔的反应是:2Fe3++Cu = 2Fe2++ Cu2+。下列有关说法不正确的是

A.Cu是还原剂,被腐蚀

B.Fe3+是氧化剂

C.该反应是置换反应

D.该反应属于离子反应

考点:氧化铁单质铁碱式碳酸铜氧化铜
题型:选择题

Part 3


Questions 19-25


·Read the following passage and answer questions 19-25.
·For questions 19-25, choose the correct answer from A, B, C and D.
·Mark your answer on the Answer Sheet.
The number of speakers of English in Shakespeare’s time is estimated to have been about five million. Today it is estimated that some 260 million people speak it as a native language. Mainly in the United States, Canada, Great Brittany, Ireland, South African, Australia and New Zealand. In addition to the varieties of English found in these areas, there are great many regional and social varieties of the language, as well as various levels of usage that are employed both in its spoken and written forms.
It is virtually possible to estimate the number of people in the world who acquired adequate work knowledge of English in addition to their own languages. The purpose for which English is learned and the situation in which such learning takes place are so varied that it is difficult to define and still more difficult to assess what constitutes an adequate working knowledge for each situation.
The main reason for the widespread demand for English is its present-day importance as a world language. Besides serving the infinite needs of its native speakers, English is a language in which some of the most important works in science, technology, and other fields are produced and not always by native speakers. It is widely used for such purpose as meteorological and airport communications, international conferences, and the spread information over the radio and television networks of many nations for the number of developing countries, especially former British colonies. Many of these countries have multi-lingual populations and need a language for internal communication as well as for international communication and for access to the scientific and technological development in the west.

______ would be likely to use English.

A.Countries where international conferences are held

B.Countries geographically close to the United States

C.Former colonies of Great Britain

D.Countries interested in the culture of the United States

题型:选择题

短期出口信用险的索赔时效为()。

A.自损失发生之日起满一年止

B.自损失发生之日起满两年止

C.自损失发生之日起满三年止

D.自损失发生之日起满五年止

题型:选择题

患者习某,男,48岁。素有小肠疝,时常发作,发作时一侧阴囊偏坠肿胀,寒疼痛加重,痛甚牵引睾丸,舌苔白,脉紧。治宜选用( )

A.一贯煎
B.橘核丸
C.厚朴温中汤
D.天台乌药散
E.暖肝煎

题型:选择题

《注册安全工程师执业资格制度暂行规定》,本规定适用于生产经营单位中从事()的专业技术人员。

A.安全生产监督

B.安全生产管理

C.安全工程技术工作

D.安全生产咨询

E.为安全生产提供技术服务的中介机构

题型:选择题

注塑机的前后安全门的动作直接联系着()安全保护装置。

A、电器

B、液压

C、机械

D、合模速度

E、模具安全

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