日韩不卡在线观看,亚洲中文字幕永久在线天堂,惠民福利久久精品国产亚洲夜色Aⅴ网站,美女视频一区二区黄是免费,动漫国产在线精品一区二区三区,免费亚洲精品影视,人妻无码中文字幕免费视频蜜桃,一区二区三区国产好的精华液,日韩精品一区二区三区中文,精品久久欧美熟妇www

Project Name: Large-scale preparation of graphene

Mechanical model, as its name implies, is about the reduction of the proportion of machinery in real equipment, such as 1:10, 1:20 and so on. If the proportion permits, it can simulate the working principle and demonstration of real equipment. Mechanical model has the advantages of equal scale scaling, height simulation, suitable transportation and exhibition. It is more and more favored by large machinery manufacturing companies. Through its unique development and special design, it continuously gives the model higher external expressive force and visual impact. It has special equipment and equipment for making ship models. This is an important means to solve the difficulty of production and to ensure the level of work technology. From a certain point of view, exquisite and delicate works are the expression of the ability of craftsmanship and tools.