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使用More O'Ferrall-Jencks坐标图分析正丁基氯和叠氮化物反应在下列条件下SN2过渡态的位置的变化：
a．亲核试剂叠氮化物变成酚氧化物；
b．离去基氯变化为碘。
答案
更多“使用More O'Ferrall－Jencks坐标图分析正丁基氯和叠氮化物反应在下列条件下SN2过渡态的位置的变化： a．”相关的问题
第2题
All the passengers were____wounded in the road accident.
A．more and more
B．by and by
C．more or less
D．little and little
第3题
| 各种结构变化对E2过渡态的影响 | |
| 变化 | 影 响 |
| 较大基团取代在带有离去基团的碳上 | a.减少脱质子化 b.更多的离去基离去 c.更多碳正离子特征 |
| 较好的离去基团 | a.减少脱质子化 b.离去基离去程度一样 |
| 放置一个吸电子基团到含有氢的碳上 | a.更多脱质子化 b.减少离去基离去 c.更多碳正离子特征 |
| 使用强碱 | a.同样程度脱质子化 b.减少离去基离去 |
第4题
We can assume from the passage that ______.
A．red beards were more fashionable than black ones
B．everyone in fourteenth-century Spain shaved
C．false beards were considered foolish by those who had real beards
D．the popularity of false beards largely died out after the fourteenth century
第5题
The passage is mainly about______.
A．beauty contests around the world
B．different opinions on beauty contests
C．why Venezuelan women are more successful in beauty contests
D．the training of beauty contestants
第6题
The passage indicates that, for Mason, political activities were ______. ()
A．undertaken only when absolutely necessary
B．a fundamental and life long preoccupation
C．something he successfully avoided throughout his life
D．something to which he always wished to devote more time and attention
第7题
A. Let me see. I thought I got more stuff than I thought.
B. O. K. I really should take up some sport.
C. Oh , I' d like to , but I' ve got to go to the library to look up some things before my two o’clock class.
第8题
Can you identify the immediate etymological source of the following words？ (For example，the immediate source of“meaning”is French，although the more remote source is Latin)能否确定下列词语的直接语源？(如：“meaning”的直接语源是法语，尽管它更远的来源是拉丁语) (a)air (b)barbecue (c)bungalow (d)Cola (e)gusto (f)babel (g)buffalo (h)cocoa (i)costume (j)ill (k)mule (l)decreed (m)revolution (n)benevolent (o)lie (p)topic (q)subject (r)theme (s)wind (t)datum
第9题
What O'Neill has said repeatedly is that the IMF should stop playing fireman，rushing to help after a Country's finances have burst into flames, and become a "fire marshal"(消防署署长) instead. This means interfering early, advising countries exactlywhat is wrong and what reforms are needed, tracking results and then issuing publicwarning when countries are heading for disaster. "If a country willfully (固执地) followsbad policies that it's been talked to about, " says O'Neill, "we can be more relaxedin saying to them: 'We are not going to be there when chickens come to roost (习语，指恶行的自作自受). '"
请根据以上材料，回答下列问题。
(1)你觉得他所说的导致一国出现货币金融危机的“坏政策”主要指的是些什么政策？试根据有关理论，说明“坏政策”是如何使一国经济陷入货币危机的。
(2)你觉得一国出现货币金融危机会完全是由于“坏政策”造成的吗？还有哪些因素也可能对现在货币金融危机的爆发负责任。
第10题
For even greater saving, always dial direct, that is, without an operator’s help. Rates(资;费) on direct calls are lower after five o’clock in the evening and lowest after eleven o’clock at night. Collect, person-to-person, and pay phone calls require the services of an operator, and they cost more than direct calls.
Need to call out of the country？ Now calls to many overseas places may be dialed direct. Check your telephone direction for overseas area codes.
Next time you have good news, or you just want to stay in touch, remember, a phone call means so much more than a letter. This has been a message from Southern Bell Telephone Company.
(1) To make a ten-minute call costs $2.60, if you are in New York and want to be connected with a person in_______.
A.Alaska B.Los Angeles
C.Hawaii D.Mexico City
(2) According to this passage, when is a dial telephone call cheapest？
A.During weekend hours.
B.After 5 in the evening.
C.During working hours.
D.After 11 at night.
(3) Which type of call requires less money？
A.A direct dial call.
B.A collect call.
C.A person-to-person call.
D.A call from a pay phone.
(4) What should one do in order to make an overseas call？
A.Dial the operator.
B.Call telephone Southern Bell Telephone Company.
C.Check the phone book for the overseas operator’s number so that he can help you.
D.Check the phone book for overseas area codes so that you can dial direct.
(5) This passage is_______.
A.an article B.letter
C.a talk D.a dialogue
第11题
A) neglected
B) protection
C) provision
D) recovery
E) compensation
F) rewarded
G) pension
H) receipt
I) occur
J) mislead
K) misunderstand
L) notice
M) notify
N) fantastic
O) ridiculous
What happens in America when someone becomes disabled and cannot do the kind of work they did in the past？ If someone has been injured on the job, they are supposed to(1)the medical worker, who would certify that there was a problem. Then, they may receive(2)from the company. If the company provides a(n)(3), the person may receive money monthly to make up for lost wages. The person who has been disabled may also take the company to court if safety was.(4)at the workplace. This usually results in(5)of a payment to settle the dispute. In addition, all workplaces are required to pay money to the government for a program to take care of people disabled on the job. One(6)in this program requires workplaces where more injuries(7)to pay more money. For this reason companies that require heavy physical labor take safety very seriously. Most people(8)disability insurance. They think it is(9)that a person should get paid without working. In fact, this benefit is usually not enough to cover the rent and other bills of those who receive it. Most of the disabled still want to work, but(10)from the injury and training for other types of employment takes time.
