下列乙醇的化学性质中,不是由羟基所决定的是[ ] A.跟活泼金属钠反应 B.在足

题型:选择题

问题:

下列乙醇的化学性质中,不是由羟基所决定的是[ ]

A.跟活泼金属钠反应

B.在足量O2中完全燃烧生成CO2和水

C.在Cu或Ag存在时跟O2发生反应生成乙醛和水

D.在浓H2SO4的作用下与CH3COOH反应生成乙酸乙酯和水

考点:乙醇
题型:选择题

已知可逆反应:AsO43-+2I-+2H+AsO33-+I2+H2O。

据此设计出如图所示的实验装置(装置中盐桥的作用是使整个装置形成一个闭合回路)。进行如下操作:

(I)向(B)烧杯中逐滴加入浓盐酸,发现微安表指针偏转;

(Ⅱ)若改向(B)烧杯中滴加40%NaOH 溶液,发现微安表指针向前述相反方向偏转。试回答下列问题:

(1)两次操作过程中微安表指针为什么会发生偏转?____。

(2)两次操作过程中指针偏转方向为什么相反?____。

(3)(I)操作过程中,C1棒发生的反应为____ 。

(4)(Ⅱ)操作过程中,C2棒发生的反应为____。

题型:选择题

第二节:阅读下列材料,从所给的六个选项(A、B、C、D、E和F)中选出符合各小题要求的最佳选项,并在答题纸上将该项标号涂黑。选项中有一项是多余选项。

___81. Emma is an oversea college student who enjoys plenty of spare time during her university life. She wants to seek a part time job to pay her tuition fee.

___82. Clifford is an MBA graduate of London University, and he once worked in ABC company as a market researcher for three years, but this company went bankrupt last year. He hopes to find another job relating to his experience.

___83. Jeffrey is a manager of Stone Net Company for ten years. He is skilled in web development and has rich web experience. But he is not satisfied with his current payment. He hopes to find a company offering salary no less than 10,000 per month.

___84. Oliver Clark used to be a tailor, and he is also familiar with sewing machine operation. He wants to apply for a clothing company.

___85. Mathew is a student journalist in the university. His typing speed is about 4,000 wph and has a good knowledge of filling procedures. He will graduate from his university this month. He hopes to find a job before graduate.

A    Net Development Manager

With seven years experience of full lifecycle experience and one year’s experience in leading a web development team. Must have strong web experience, including ASP, ASP. NET,C#, XML, XSL, Html, XHtml and CSS. We are looking for a technical person who is able to specify and deliver solutions.

Salary $156,000 per year

Phone 734 4897 for an appointment

B   Market Researcher

A financial services company requires a market researcher who must be educated to degree level or with a market research qualification and experience of a year in this field.

Salary: $18,000 per year          Tel: 324 7345

C    Emu Airlines Secretary

Emu Airlines is now offering a permanent, part time secretarial position. The position offers a minimum of 20 hours a week, with a view to full time work in the future.

Phone 899 3264 for an appointment.

D    City College Union Inc. Secretary

The Union is a student run organization with a permanent staff of 20. Typing speed of at least 3,600wph. The ability to take shorthand dictation and a working knowledge of filling procedures are essential requirements. The basic salary for the position is $18,500 per year.

Enquires to R. Barbar 387 5075

E    Word Processor Operator (full-time)

Applications are invited for an operator to work in an office associated with the building industry. Only experienced operators need apply.

Starting salary $17,950

Apply in writing to: The Personnel Officer Hill Morgan Pty Ltd. 38 Greenhill Rd. Kensington 2033

F    Sewing Machinist

We are an expanding clothing company located south of the city. Our denim range includes jeans, skirts, jackets and shorts. We are looking for sewing machine operators. The factory works 38 hours a week. Wages and conditions are in line with the current industrial award. If you are interested, call in and pick up an application form from Ripper Jeans, 23 North Ave, Beaudesert. cbafd

题型:选择题

我国研制成功的第一枚核弹是哪一年:()

A、1964年

B、1952年

C、1945年

D、1943年

题型:选择题

主要承重结构按承载能力极眼状态设计时,考虑偶然事件作用的结构可靠指标可()。

A.适当提高

B.保持不变

C.适当降低

D.显着提高

题型:选择题

用哇巴因抑制钠泵活动后,细胞不会出现

A.静息电位减小

B.动作电位幅度减小

C.细胞膜内外Na+浓度差减小

D.Na+-Ca2+交换增加

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