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  3. Which of the following gives a general idea of how the noise-killing system works? Besides its main use the noise-killing syste

Which of the following gives a general idea of how the noise-killing system works? Besides its main use the noise-killing syste

admin2009-08-15  41
问题 Which of the following gives a general idea of how the noise-killing system works?
Besides its main use the noise-killing system can ______.
选项 A、make a car lighter
B、make a car quieter
C、reduce the cost of a silencer
D、improve the performance of a silencer
答案A
解析 通过文章第四段Another good thing about the use of noise-killing systems is that it saves the need for a silencer；this not only reduces the weight of a car...得知。
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