喷吹燃料的主要作用是可以改善冶炼强度、降低（）使用量，从而节约生铁成本。

When you want to see if a library has the book you want, you can use the catalogue(目录) in the Library. Most catalogues of books in a library take the form of small cards kept in boxes. One way of arranging (排列) the cards is in ABC order by the family names of the writers.

　　Catalogue cards usually give the following important information: (1 )the name of the writer, (2)the shelf-n k(架号) ,that is ,the Dewev number which helps people to find where the books are, (3) the title of the book, (4)the year of publication and the publisher, and (5)the number of pages in the book.

1．if you know the title of a book and want to find out if it is in the catalogue, what else do you need to know?

　　A. The shelf-mark.　　B. The name of the writer.

　　C. The Dewey number.　　D. The year of publication.

2. Which of the following is the kind of catalogue card described in the text?

A. 428.65 Brooks,J.and Grundy,P.Writing for Study PurposesCambridge University I ‘ns~(1954) 78pp

B. 783.25 The best bookfor writing practicePractical Writing (1965) 213pp

C.315.08 Reading Skills Beijing University Press (1990) 160pp

D.921 .87 Smith, J Practical ReachingThe People’s Publishing House (1989)

治疗痤疮下列抗生素首选哪一种（）。

A.先锋霉素4号

B.先锋霉素6号

C.庆大霉素

D.四环素

E.链霉素

夹板法制作7/2.6拉线中把的制作规格为一个夹板，间隔（）mm、缠（）mm、间隔（）mm收口。

省政府决定从2007年1月起，将全省农村低保标准由家庭年人均收入1000元提高到1200元。

输变电设施的“不可用”状态是指（）的状态，分为计划停运状态和非计划停运状态。