为某建筑选消火栓泵，消防水池最低水位与最不利消火栓的高差为48.0m，管路系统沿程水

艺术典型主要包括（）、典型形象等。

混凝土配合比计算中，试配强度（配制强度）高于混凝土的设计强度，其提高幅度取决于下列中的哪几种因素？Ⅰ．混凝土强度保证率要求Ⅱ．施工和易性要求Ⅲ．耐久性要求Ⅳ．施工控制水平Ⅴ．水灰比Ⅵ．集料品种（）

A.Ⅰ、Ⅱ

B.Ⅰ、Ⅲ

C.Ⅴ、Ⅵ

D.Ⅰ、Ⅳ

Americans who volunteer for the Peace Corps get a chance to help improve lives in developing countries. They also get a chance to learn more about the world, and about themselves. This week this program is celebrating its 50th anniversary.

President John Kennedy established the Peace Corps soon after he took office in 1961. It was the time of the Cold War between the United States and the Soviet Union. The new program gave Americans a chance to answer the call to service that the president made in his inaugural(就职的)speech. “Ask not what your country can do for you,” he said. “Ask what you can do for your country.” Kennedy told Peace Corps volunteers that America’s image in the countries where they were going would depend largely on them.

On August 30th, 1961, the first group of 51 Peace Corps volunteers arrived in Accra, Ghana, to serve as teachers. They had agreed to work for almost no pay. They would spend two years in Ghana helping its people and learning the reality of life in a developing country. Most of the volunteers had just completed college. About half of them taught English or health care. In the 50 years since then, more than 200，000 Americans have served as Peace Corps volunteers. They have worked in 139 countries.

The Peace Corps is a government agency that was created to promote world peace and friendship. There are three goals: First, to help the people of interested countries in meeting their need for trained men and women. Second, to help promote a better understanding of Americans on the part of the people served. And, third. to help promote a better understanding of other people on the part of Americans.

Today, the Peace Corps has more than 8,000 volunteers and trainees in 77 countries. They work in agriculture, economic development, education, the environment and health care. Some work in programs related to youth development.

Sixty percent of current Peace Corps volunteers are women. The average age of a volunteer is 28. But the ages of Peace Corps volunteers range from 18 to 86. Some Americans join the Peace Corps after they retire. Today seven percent of volunteers are over the age of 50. And 19 percent are members of minority groups.

小题1:Volunteers for the Peace Corps can _______.

A．improve their abilities by learning in some developed countries

B．travel to many foreign countries to learn more about the world

C．have an opportunity to help all the people in developing countries

D．contribute to lives in developing countries and develop themselves小题2:Which of the following is TRUE according to the text?

A．Volunteers served as teachers to work for no pay in Accra, Ghana.

B．Kennedy established the Peace Corps before he took office in 1961.

C．Most of the volunteers of the first group had just graduated from college.

D．America’s image in the foreign countries depends completely on volunteers.小题3:The fourth paragraph is mainly about _______.

A．what the Peace Corps is and its steps

B．why the Peace Corps was created and what are its goals

C．what role the Peace Corps play in daily life

D．How the Peace Corps was created and its aims小题4:According to the text, volunteers and trainees assist in the following aspects EXCEPT _______.

A．industry

B．environment

C．education

D．health care小题5:What can we learn from the last paragraph?

A．Most of the volunteers for the Peace Corps are women.

B．Few minority groups joined the Peace Corps.

C．Half of the retired volunteers joined the Peace Corps.

D．People of different ages take an active part in the Peace Corps.

Flash动画中使用（）作为基本的图形存储格式。

A.矢量图

B.灰度图

C.伪彩色图

D.真彩色图

某公司分别以D/P AT 90 DAYS AFTER SIGHT和D/A AT 90 DAYS AFTER SIGHT两种支付条件对外出口了两批货物，关于这两笔业务，下列叙述正确的有( )。

A．前者是进口人在到期日付清货款后才可取得货运单据，后者是进口人在见票时承兑后即可取得货运单据

B．对前者卖方没有货款两空的风险，而后者对于卖方存在这种风险

C．前者的风险比后者大

D．后者的风险比前者大