并联部件的数量越多，每一并联部件对系统可靠性提高所起的作用越（），所以一般并联（）个
题型：单项选择题
问题：
并联部件的数量越多，每一并联部件对系统可靠性提高所起的作用越（），所以一般并联（）个部件为宜。
A.大/1—2
B.大/2—3
C.小/3—4
D.小/2—3
题型：单项选择题
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 All the five 2008 Olympic mascots (吉祥物) have become top fashion. The more you know about them, 1 you will understand the Olympics in China. Since China made its final decision at 8 p. m. November 11, the five mascots have been seen everywhere. If you put their 2 together, they say "Beijing welcomes you!" in Chinese. People rushed into many 3 to buy them. Some shelves were empty after only one day of business. Do you know why the mascots 4 kids?" Children are the future of the world. So we have five childlike mascots," said Wu Guanying, one of the designers. Wu 5 the idea of five dolls. When artists'finished the first designs in April, they showed their work to some kids 6 if they liked them. They were quite happy at seeing the lovely images (形象). They had many ideas about 7 they meant."There were all kinds of answers. Some kids thought the mascots were a family of earth protectors (保护者). One even thought 8 was a daughter of the sea." said Wu. An Olympic mascot is a symbol (标志) for the games. It's always an image with something special for the people of 9 . Also, it carries people's 10 for the success of the games.
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