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翻译文段 However simple, any machine is a combination of individual components generally referred to as machine elements or parts. Thus, if a machine is completely dismantled, a collection of simple parts remains such as nuts, bolts, springs, gears, cams and shafts - the building block of all machinery. A machine element is, therefore, a single unit designed to perform a specific function and capable of combining with other elements. Sometimes certain elements are associated in pairs, such as nuts and bolts or keys and shafts. In other instance, a group of elements is combined to form a subassembly, such as bearings, couplings, and clutches.
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【单选题】At last, about twent7 people ______ at the meeting.
A.
turned on
B.
turned up
C.
turned off
D.
turned out
【单选题】The greatest recent social changes have been【C1】______ the lives of women. During the twentieth century there has been a remarkable shortening of the【C2】______ of a woman's life spend in【C3】______ for...
A.
of
B.
for
C.
in
D.
to
【单选题】在Windws7中,关于回收站叙述正确的是:
A.
回收站大小是固定不变的。
B.
回收站中的文件或文件夹是可恢复的。
C.
U盘中的文件被删除后也放入回收站。
D.
回收站中存放的文件断电后自动删除。
【单选题】Shopping habits in the United States have changed greatly in the last quarter of the twentieth century. (1)_____ in the 1990s most American towns and cities had a Main Street. Main Street was always i...
A.
As early as
B.
Early
C.
Early as
D.
Earlier
【简答题】Women also are more active in sports now because of two changes. First, in the early twentieth century, women began to compete regularly in the Olympics. Also, the number of s for women in the Ol...
【简答题】实验三查询3_sql-jxgl.txt 电子作业2-SQL语句练习.doc
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