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<div>汽�R噪声主要来自汽�R排气噪声。若不加消声器，噪声可达100分贝以上。其�ơ�ؓ(f��)引擎噪声和轮胎噪壎ͼ�引擎噪声在汽车正常运转时�Q�可�?0分贝以上�Q�而轮胎噪声在车速�ؓ(f��)90公里/时以上时�Q�可�?5分贝左右。因此，在排气系�l�中加上消声器，可��汽�R排气噪声降低20-30分贝。在引擎斚w���Q�以汽��a引擎代替柴��a引擎�Q�可以降低引擎噪�?-8分贝 �?/div>            <ul class="pager">
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