分述汽油辛烷值的现状和存在问题；汽车排气控制标准对节能及油品规格的影响；
The state of art and existing problems of fuel qualities including gasoline octane number were discussed.
汽车需要在家里插座上充电六个小时，排出的尾气通过排气筒将送到当地发电厂，那里尾气容易得到控制。
The car will take six hours to recharge from a home outlet - outsourcing pollution from your tailpipe to your local power plant, where it may be easier to control.
发动机排气噪声是汽车噪声中一个主要声源，消声器是控制排气噪声的一个重要方法。
Engine exhaust noise is one of the main sources of automobile noise, and using of silencer is an important method controlling exhaust noise.
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