日韩成人无码中文字幕,波多野结衣一区二区三区高清,大战熟女丰满人妻av,亚洲精品色情app在线下载观看,东北少妇不戴套对白第一次

Project Name: Earth Pressure Balanced Rectangular Pipe Jacking Machine

Proportion of projects: 1:20

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. The 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 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.