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为使汽车车身具有很好的密封性、防锈性、耐久性和舒适性，构成车身的壁板的接合面上都需涂密封材料，同时，为防止汽车底部被飞石等击伤，涂膜击伤，露出钢板，短期间就生锈，汽车底部需涂布车底涂料。...查看全文
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