问题 问答题 简答题

一个完整的精馏塔由几段组成?进料在哪一段?

答案

参考答案:

一个完整的精馏塔由提馏段、进料段、精馏段构成,进料在进料段。

阅读理解

China is now sending more college students to study in the United States than any other country.  A new report shows a 23 percent increase in the number of Chinese students coming to the U.S.

The latest edition of the annual Institute of International Education(IIE)and another US institute found a 5 percent rise in the number of international university students in the US compared to one year ago. There are now over 157, 000 Chinese students at U.S. colleges and universities.

Aisa accounted for four of the top five countries and regions to take advantage of the US higher education system. “Increased numbers of students from China, particularly at the undergraduate level, largely accounts for the growth this past year,” the report stated. “They really enroll in a full range of US higher education,” said Peggy Blumenthal, senior counselor to the president of IIE, the group that made the report. “20 years ago, students from China only knew of a handful of US insitiutions, but now, they are enrolling in our community colleges, in our small liberal arts institutions, in the research universities. Really spread across the country,” she said.

Chinese mainland was in the number one spot, while India was the number two country of origin. South Korea was third and Canada was number four. China’s Taiwan held the number five spot. Saudi Arabia was in sixth with a 44-percent increase, while Japan was seventh, down 14 percent.

Blumenthal attributes the increase in the number of Chinese students heading to US colleges to limited university places in China, as well as a feeling from students and their parents than they want a “unique” educational experience. China’s family planning policy, says Blumenthal, has also meant that families can concentrated resources on a single child.

The University of California at Los Angeles has one of the largest Asian student populations of any college in the United States.

小题1:Which ranked the third place sharing US higher education?

A.Saudi Arabia

B.South Korea

C.Canada

D.India小题2:Why is the number of Chinese students going to the US increasing?

A.The US colleges are better than those in China.

B.Each family in China has only one child.

C.China lacks enough educational resources.

D.Chinese students can enter varieties of US colleges.小题3:Which of the following is right according to Peggy Blumenthal?

A.The number of Chinese students going to the US has increased by 23%.

B.The University of California has contributed to Asian education greatly.

C.Chinese student populations in the US mainly consist of undergraduates.

D.Chinese students know more about US higher education than before.小题4:The best title for the passage can be           .

A.Chinese College Students Rush to US Schools

B.The Large Number of Chinese Students in the US

C.Chinese Students Make Up Largely Foreign Students in the US

D.Asian Middle School Students in the US Universities

单项选择题

材料一煤炭是我国最安全、最经济、最可靠的能源。我国能源资源的基本特点决定了煤炭在一次能源中的重要地位。我国煤炭资源总量远远超过石油和天然气资源;我国煤炭资源总量为5.6万亿吨,其中已探明储量为1万亿吨,占世界总储量的11%。(石油占2.4%,天然气占1.2%)
材料二 中国能源30%依赖石油,而30%的石油需要进口。中国现在是世界上第二大能源消费国,也是第二大石油进口国。专家预测,到2020年,我国石油需求将达4.3亿吨,而届时中国的石油产量只有2亿吨,对外依存度达60%。
材料三 由于世界能源的短缺和环境保护的需要,醇类燃料是自20世纪70年代以来成为新能源开发的方向之一。车用乙醇汽油是在加入一定比例的变性燃料乙醇后调配成的一种新型清洁车用燃料。变性燃料乙醇是以玉米、小麦、薯类、甘蔗、甜菜等为原料,经发酵、蒸馏制得乙醇,脱水后再添加变性剂变性的燃料乙醇。经国务院批准,自2002年6月30日起,郑州、洛阳、南阳、哈尔滨、肇东5个城市,开展了为期1年的车用乙醇汽油试点工作,在试点成功的基础上,把试点范围扩大到黑龙江、吉林、辽宁、河南、安徽5省及湖北、山东、河北和江苏4省的部分地区,到2005年年底上述地区基本实现车用乙醇汽油代替其他汽油。

我国广泛推广使用乙醇汽油的哲学依据是( )。

A.矛盾的普遍性与特殊性的观点

B.普遍联系的观点

C.质量互变规律

D.意识的能动性