Ok, first of all, what is painted oil made by? Painted oil is a colored liquid material which made by polyurethane resin, polyvinyl...

Check whether leather is consistent with the correct model, delimit to typesetting, according to the paper's size, shape, and the...

Q: Why in the oil edge process, it is better to use the bottom step as the bottom fill? A: Because of base oil, special bridge as the...

The zipper consists of chain teeth, pull heads, limit codes (front and back codes) or lock fasteners. Among them, the chain tooth is the...