初尝黑人嗷嗷叫中文字幕,日韩精品一区二区三区色欲AV,人妻互换精品一区二区,大波妺AV网站影院

Laser-marked light-transmitting patterns on lacquered plastic parts, in fact, after spraying transparent plastic panels, the surface coating is removed with a laser marking machine to reveal the original background color. This process has certain requirements for the uniformity of the coating thickness, the configuration of the laser equipment and the technology.