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Can silk hair cut students' heads? 5 Paper-cut is one of the most popular folk art in China,According to archaeology, its history can be traced back to the sixth century in AD,But people think it actually started hundreds of years earlier than this.Paper cutting is commonly used in religious ceremonies,Decoration and plastic arts.\ R in the past,People often use paper to make different images and portraits,Buried with the deceased or burned at the funeral,This custom is sometimes visible outside China.Paper-cut art is generally symbolic,It is also part of this kind of ceremony;In addition, paper-cut is also used as an ornament for sacrifice to ancestors and gods.\ R is generally popular because of its easy access to materials, low cost, effective and wide adaptability;More because it is most suitable for rural women's leisure production,It can be used as a practical thing,And beautify life.Paper cuts can be seen all over the country,Even formed different local style schools.Paper-cut not only shows the aesthe

Rebar sent to the construction site to the supervision material list also needs inspection report? 1. yes,According to GB50204-2015 5th.2.Article 1 stipulates the acceptance method,Require inspection quality certification documents and sampling inspection reports.2. the Product Certificate and factory inspection report of steel bar materials are the certification materials for product quality,The main performance indicators of the product should be listed;When the user has a special request,Some special inspection data should also be listed.Sometimes,Product Certificate and factory inspection report can be merged.The entry reinspection report is the result of the approach sampling inspection,And as the basis for judging whether the material can be applied in the project.3. for the inspection quantity of each batch of steel bars,Shall be implemented according to relevant product standards.International Standard '1st steel for reinforced concrete: Hot Rolled round steel bars' GB1499.1-2008 and 'Steel for rein

Papers on sewage treatment You can go to the 114 paper network for reference, here are new technologies, I hope to be interested.BF Ms technology is in the traditional coagulation process,Add magnetic powder,To enhance the effect of coagulation,To form high-density floc and increase the proportion of floc,To achieve the purpose of efficient decontamination and rapid settlement.Ion polar and metal properties of magnetic powder,As the core of the floc,Greatly strengthened the ability of coagulation and binding of suspended pollutants in water,Reduce the amount of disinfectant,In removing suspended matter,Especially in the removal of phosphorus, bacteria, viruses, oil, heavy metals and other aspects of the effect is better than the traditional process.As the proportion of magnetic powder is as high as 5.0 × 10 kg/m ,About twice as much as sand,The specific gravity of the floc mixed with magnetic powder increases,Rapid settlement of floc,The speed can reach 20 m/s or more,The whole water treatment c