IPSec 不能提供以下哪种服务______。A．流量保密 B．数据源认证 C．

一吊车在2s内将1500Ｎ的货物提高2ｍ后，在空中停留了3s，又在5s内沿水平方向将货物移送了10ｍ，则10s内吊车的功率为[ ]

A、300Ｗ

B、2000Ｗ

C、3000Ｗ

D、1500Ｗ

阅读理解

     The World Trade Organization came into existence in the 1990s.It operates a system of trade rules.It

serves as a place for nations to settle disagreements and negotiate agreements to reduce trade barriers.The

newest of its 150 members,Vietnam,joined in January.

     But the roots of  the WTO date back to World War Two and the years that followed. In 1944, the

International Monetary (货币的) Conference agreed to create the International Monetary Fund and the

World Bank.But they could not agree on an organization to deal with international trade.

     Three years later,in 1947,twentythree nations approved the General Agreement on Tariffs (关税) and

Trade,or GATT.It_was_meant_to_be_temporary.Trade negotiations under GATT were carried out in a

series of talks called rounds.The first round lowered import taxes on onefifth of world trade.Later rounds

produced additional cuts,and negotiators added more issues.

     The sixth round began in 1963.It was called the Kennedy Round after the murder of President John

F．Kennedy.The results included an agreement against trade dumping.This is when one country sells a

product in another country at an unfairly low price.

     The eighth round of talks began in Punta del Este,Uruguay,in 1986.The Uruguay Round lasted almost

twice as long as planned.In all,123 nations took part in sevenandahalf years of work.They set time limits

for future negotiations.They also agreed to create a permanent system to settle trade disagreements.

     In April of 1994,most of those 123 nations signed an agreement.It replaced GATT with the World

Trade Organization.

     The WTO launched a new round on development issues in Doha,Qatar,in November of 2001.These

talks were supposed to end by January of  2005. But negotiators could not agree on  issues involving

agricultural protections.The current round has been suspended since last July.

1．The WTO got this name in the year________.

A．1947 

B．1963  

C．1986  

D．1994

2．Which of the following statements about GATT is NOT true?

A．It was set up after World War ?.

B．It was first approved by less than 30 countries.

C．It was a branch of the World Bank.

D．It was meant to improve international trade.

3．What does the underlined sentence in the third paragraph mean?

A．The founders wanted GATT to bring in money.

B．The founders didn't expect GATT to last long.

C．GATT was ready to change its name at the very beginning.

D．GATT was open for more member countries.

4．What is one of the results of the Uruguay Round?

A．A permanent system was agreed on.

B．It lasted almost eight years.

C．More countries took part in it.

D．More disagreements than expected were settled.

5．Which of the following is the best title of the passage?

A．Why the WTO was Called GATT?

B．WTO Talk Rounds Last Longer

C．A Brief Introduction to the WTO

D．GATT or WTO?A Real Question

（）及以上容量发电机变压器组应按双重化原则配置微机保护（非电量保护除外）。

A.100MW

B.80MW

C.120MW

D.200MW

成年人的晶体在裂隙灯光学切面下可分辨出：

A．胚胎核

B．胎儿核

C．婴儿核

D．成年核

E．皮质

简述水质标准中细菌总数的定义及卫生学意义。