One theory is that the wheels of vehicles in heavy traffic on the day after Thanksgiving day left many black markings on the road surface, leading to the term black Friday.
其中一种说法是感恩节之后这一天拥挤的交通会使车轮在路面留下很多黑色痕迹，就有了“黑色星期五”这个说法。
Steel surface should be no visible oil, dirt, scale, rust and paint coating attachments, any markings should be only slight discoloration of dot or stripes.
钢材表面应无可见的油脂、污垢、氧化皮、铁锈和油漆涂层附着物，任何残留痕迹应仅具点状或条纹状的轻微色斑。
Primer, a bonding material is used when making the heat fusion road markings. The prime can prevent the film from coming off and strengthen the adhesive force between the film and the road surface.
底漆是涂布路面标线用热熔涂料时使用的粘结材料，底漆起着防止涂膜剥落，提高涂膜和路面粘着力的作用。
Primer, a bonding material is used when making the heat fusion road markings. The prime can prevent the film from coming off and strengthen the adhesive force between the film and the road surface.
底漆是涂布路面标线用热熔涂料时使用的粘结材料，底漆起着防止涂膜剥落，提高涂膜和路面粘着力的作用。
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