在客户机/服务器计算模式中，响应并发请求通常采取的两种方法是( )。A．递归服务器

An Englishman was showing a foreign visitor around London. “What’s that strange building?” asked the visitor. “That’s the Tower of London.” “I see. How long did it take to build it?” “About 500 years.” “In my country we can build it in five months,” Shortly after that they came to St. Paul’s Cathedral(大教堂). “Very interesting!” said the visitor. “How long did it take to build it ?” “Near forty years.” said the Englishman. “In my country we can finish it in forty days at most,” said the visitor. This went on all day.

They visited most of the best known buildings in the city. Every time they saw a new one, the visitor asked what it was and how long it took to build it. Then he said that they could do the same thing much faster in his country.

At last the Englishman got angry with the visitor though he tried not to show it. Several days later they came to the House of Parliament(议会)and the visitor asked his usual question, “What is that?” The Englishman answered, “ I have no idea. It wasn’t there last night.”

小题1:The Englishman showed the foreign visitor around _______ one day.

A．The Tower of London

B．St. Paul’s Cathedral

C．Some famous buildings in the city

D．The whole city of London小题2:The visitor said that in his country it would take them ______ to build the Tower of London.

A．less than half a year

B．forty days

C．five hundred years

D．fifty days小题3:It took them a few days to see ______.

A．some of the best known buildings in England.

B．several best known places in England

C．many famous houses in the city of London

D．most of the best known buildings in London小题4:The Englishman was angry by the end of the day, but he ______.

A．didn’t want to say anything

B．tried to show it to the visitor

C．had no time to tell the visitor

D．tried not to show it to the visitor小题5:The Englishman’s answer to the question of the last place showed_____.

A．he was sorry that he hadn’t seen the building before

B．he could say nothing because he didn’t know anything about it

C．he was angry and didn’t want to tell the visitor its name

D．he didn’t know how to tell the visitor the name of the building

下列溶液中各微粒的浓度关系正确的是

A．pH＝4的盐酸中：c（H⁺）＝4.0mol·L^－1

B．NH₄Cl溶液中：c（Cl^－）＝c（NH₄⁺）

C．NaCl溶液中：c（Na⁺） + c（H⁺）＝ c（Cl^－）+c（OH^－）

D．NaHCO₃溶液中：c（HCO₃^－）＋c（H₂CO₃）+ c（CO₃^2－） ＝c（Na⁺）

资源开发和利用活动可分成两大类，即基本活动和（）。

A.企业战略活动

B.企业行业活动

C.最终产品的活动

D.支持活动

证据学的研究对象

以景石现场施工为例说明为什么要加强施工安全管理？