Factors that affect the surface resistance of the board include the board material, the presence of coatings such as solder masking or conformal coatings, and board cleanliness.
影响印制板表面电阻的因素包括印制板材料、有无涂层(例如防焊漆或保形涂层)，以及电路板的清洁。
The influence factors of the surface cleanliness of cold-rolled sheet are introduced and the reasons and composition of the post-annealing black stain and edge carbon are mainly analyzed.
对冷轧板表面清洁度的影响因素进行了综述，并重点探讨了退火黑斑和边缘碳的组成和成因。
A great deal of tests show that the finishing equipment has a very good effect on reducing crank's surface roughness, increasing its microhardness and cleanliness.
同时经过大量的实验验证，光整加工设备对降低曲轴表面粗糙度、提高表面显微硬度和清洁度能够起到很好的效果。
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