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Polylactic acid (PLA) is a new bio-based and renewable biodegradable material, which is made of starch raw materials proposed by renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, then glucose and certain strains are fermented to produce high purity lactic acid, and polylactic acid with certain molecular weight is synthesized by chemical synthesis method. It has good biodegradability, can be completely degraded by microorganisms in nature under specific conditions after use, and finally generates carbon dioxide and water without polluting the environment, which is very beneficial to environmental protection and is recognized as an environment-friendly material. This thing is actually a long piece, and then "curled up" in it and wrapped in a cylinder shape. What's the use? You will see it in a short time.Specification for printed boards金二看着小葱心想，玄武将军一定是怕他牵扯出刘水生大人，才阻止他的。汪滶迷茫道：我不记得她的样子了。　　·影片中企鹅的舞蹈是踢踏舞。这是一部反映现代青少年青春期生活的校园偶像剧，故事从一群热爱篮球但是水平不高的初三男生和同年级篮球最强班五班之间以球会友的故事开始。Automatic mode shooting